Home / 128,487.20-177,317.28-71,897.36

Finding the Fourth Proportional to 128,487.20, 177,317.28 and 71,897.36

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Solution

The fourth proportional to 128,487.20, 177,317.28 and 71,897.36 is: 99,221.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,487.20 : 177,317.28 = 71,897.36 : x
  2. Step 2: Convert to fraction form
    128,487.20/177,317.28 = 71,897.36/x
  3. Step 3: Cross multiply
    128,487.20x = 177,317.28 × 71,897.36
  4. Step 4: Simplify right side
    128,487.20x = 12,748,644,314.38
  5. Step 5: Solve for x
    x = 12,748,644,314.38/128,487.20
  6. Step 6: Final answer
    x = 99,221.12

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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.