Home / 678,286.40-1,017,429.60-521,307.20

Finding the Fourth Proportional to 678,286.40, 1,017,429.60 and 521,307.20

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Solution

The fourth proportional to 678,286.40, 1,017,429.60 and 521,307.20 is: 781,960.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,286.40 : 1,017,429.60 = 521,307.20 : x
  2. Step 2: Convert to fraction form
    678,286.40/1,017,429.60 = 521,307.20/x
  3. Step 3: Cross multiply
    678,286.40x = 1,017,429.60 × 521,307.20
  4. Step 4: Simplify right side
    678,286.40x = 530,393,375,973.12
  5. Step 5: Solve for x
    x = 530,393,375,973.12/678,286.40
  6. Step 6: Final answer
    x = 781,960.80

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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.