Home / 678,287.90-1,017,431.85-521,308.70

Finding the Fourth Proportional to 678,287.90, 1,017,431.85 and 521,308.70

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Solution

The fourth proportional to 678,287.90, 1,017,431.85 and 521,308.70 is: 781,963.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,287.90 : 1,017,431.85 = 521,308.70 : x
  2. Step 2: Convert to fraction form
    678,287.90/1,017,431.85 = 521,308.70/x
  3. Step 3: Cross multiply
    678,287.90x = 1,017,431.85 × 521,308.70
  4. Step 4: Simplify right side
    678,287.90x = 530,396,075,062.10
  5. Step 5: Solve for x
    x = 530,396,075,062.10/678,287.90
  6. Step 6: Final answer
    x = 781,963.05

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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.