Home / 513,981.12-709,562.40-320,447.28

Finding the Fourth Proportional to 513,981.12, 709,562.40 and 320,447.28

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Solution

The fourth proportional to 513,981.12, 709,562.40 and 320,447.28 is: 442,384.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    513,981.12 : 709,562.40 = 320,447.28 : x
  2. Step 2: Convert to fraction form
    513,981.12/709,562.40 = 320,447.28/x
  3. Step 3: Cross multiply
    513,981.12x = 709,562.40 × 320,447.28
  4. Step 4: Simplify right side
    513,981.12x = 227,377,341,070.27
  5. Step 5: Solve for x
    x = 227,377,341,070.27/513,981.12
  6. Step 6: Final answer
    x = 442,384.62

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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.