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Finding the Fourth Proportional to 587,206.40, 880,809.60 and 390,214.40

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Solution

The fourth proportional to 587,206.40, 880,809.60 and 390,214.40 is: 585,321.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    587,206.40 : 880,809.60 = 390,214.40 : x
  2. Step 2: Convert to fraction form
    587,206.40/880,809.60 = 390,214.40/x
  3. Step 3: Cross multiply
    587,206.40x = 880,809.60 × 390,214.40
  4. Step 4: Simplify right side
    587,206.40x = 343,704,589,578.24
  5. Step 5: Solve for x
    x = 343,704,589,578.24/587,206.40
  6. Step 6: Final answer
    x = 585,321.60

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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.