Home / 128,972.76-177,982.50-72,384.13

Finding the Fourth Proportional to 128,972.76, 177,982.50 and 72,384.13

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Solution

The fourth proportional to 128,972.76, 177,982.50 and 72,384.13 is: 99,890.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,972.76 : 177,982.50 = 72,384.13 : x
  2. Step 2: Convert to fraction form
    128,972.76/177,982.50 = 72,384.13/x
  3. Step 3: Cross multiply
    128,972.76x = 177,982.50 × 72,384.13
  4. Step 4: Simplify right side
    128,972.76x = 12,883,108,417.73
  5. Step 5: Solve for x
    x = 12,883,108,417.73/128,972.76
  6. Step 6: Final answer
    x = 99,890.15

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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.