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Finding the Fourth Proportional to 876,856.80, 1,315,285.20 and 285,880.80

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Solution

The fourth proportional to 876,856.80, 1,315,285.20 and 285,880.80 is: 428,821.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    876,856.80 : 1,315,285.20 = 285,880.80 : x
  2. Step 2: Convert to fraction form
    876,856.80/1,315,285.20 = 285,880.80/x
  3. Step 3: Cross multiply
    876,856.80x = 1,315,285.20 × 285,880.80
  4. Step 4: Simplify right side
    876,856.80x = 376,014,785,204.16
  5. Step 5: Solve for x
    x = 376,014,785,204.16/876,856.80
  6. Step 6: Final answer
    x = 428,821.20

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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.