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Finding the Fourth Proportional to 128,266.61, 177,008.15 and 71,677.98

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Solution

The fourth proportional to 128,266.61, 177,008.15 and 71,677.98 is: 98,915.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,266.61 : 177,008.15 = 71,677.98 : x
  2. Step 2: Convert to fraction form
    128,266.61/177,008.15 = 71,677.98/x
  3. Step 3: Cross multiply
    128,266.61x = 177,008.15 × 71,677.98
  4. Step 4: Simplify right side
    128,266.61x = 12,687,586,814.73
  5. Step 5: Solve for x
    x = 12,687,586,814.73/128,266.61
  6. Step 6: Final answer
    x = 98,915.75

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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.