Home / 715,788.28-987,806.70-389,123.26

Finding the Fourth Proportional to 715,788.28, 987,806.70 and 389,123.26

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Solution

The fourth proportional to 715,788.28, 987,806.70 and 389,123.26 is: 537,000.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,788.28 : 987,806.70 = 389,123.26 : x
  2. Step 2: Convert to fraction form
    715,788.28/987,806.70 = 389,123.26/x
  3. Step 3: Cross multiply
    715,788.28x = 987,806.70 × 389,123.26
  4. Step 4: Simplify right side
    715,788.28x = 384,378,563,353.84
  5. Step 5: Solve for x
    x = 384,378,563,353.84/715,788.28
  6. Step 6: Final answer
    x = 537,000.36

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.