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Finding the Fourth Proportional to 128,562.42, 177,406.29 and 71,966.10

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Solution

The fourth proportional to 128,562.42, 177,406.29 and 71,966.10 is: 99,307.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,562.42 : 177,406.29 = 71,966.10 : x
  2. Step 2: Convert to fraction form
    128,562.42/177,406.29 = 71,966.10/x
  3. Step 3: Cross multiply
    128,562.42x = 177,406.29 × 71,966.10
  4. Step 4: Simplify right side
    128,562.42x = 12,767,238,806.77
  5. Step 5: Solve for x
    x = 12,767,238,806.77/128,562.42
  6. Step 6: Final answer
    x = 99,307.70

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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.