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Finding the Fourth Proportional to 876,659.40, 1,314,989.10 and 315,491.40

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Solution

The fourth proportional to 876,659.40, 1,314,989.10 and 315,491.40 is: 473,237.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    876,659.40 : 1,314,989.10 = 315,491.40 : x
  2. Step 2: Convert to fraction form
    876,659.40/1,314,989.10 = 315,491.40/x
  3. Step 3: Cross multiply
    876,659.40x = 1,314,989.10 × 315,491.40
  4. Step 4: Simplify right side
    876,659.40x = 414,867,752,143.74
  5. Step 5: Solve for x
    x = 414,867,752,143.74/876,659.40
  6. Step 6: Final answer
    x = 473,237.10

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.