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Finding the Fourth Proportional to 128,020.77, 176,700.29 and 77,761.89

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Solution

The fourth proportional to 128,020.77, 176,700.29 and 77,761.89 is: 107,330.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,020.77 : 176,700.29 = 77,761.89 : x
  2. Step 2: Convert to fraction form
    128,020.77/176,700.29 = 77,761.89/x
  3. Step 3: Cross multiply
    128,020.77x = 176,700.29 × 77,761.89
  4. Step 4: Simplify right side
    128,020.77x = 13,740,548,125.14
  5. Step 5: Solve for x
    x = 13,740,548,125.14/128,020.77
  6. Step 6: Final answer
    x = 107,330.62

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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.