Home / 678,287.40-1,017,431.10-521,308.20

Finding the Fourth Proportional to 678,287.40, 1,017,431.10 and 521,308.20

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Solution

The fourth proportional to 678,287.40, 1,017,431.10 and 521,308.20 is: 781,962.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,287.40 : 1,017,431.10 = 521,308.20 : x
  2. Step 2: Convert to fraction form
    678,287.40/1,017,431.10 = 521,308.20/x
  3. Step 3: Cross multiply
    678,287.40x = 1,017,431.10 × 521,308.20
  4. Step 4: Simplify right side
    678,287.40x = 530,395,175,365.02
  5. Step 5: Solve for x
    x = 530,395,175,365.02/678,287.40
  6. Step 6: Final answer
    x = 781,962.30

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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.