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Finding the Fourth Proportional to 100,685.95, 138,931.41 and 57,658.75

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Solution

The fourth proportional to 100,685.95, 138,931.41 and 57,658.75 is: 79,560.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,685.95 : 138,931.41 = 57,658.75 : x
  2. Step 2: Convert to fraction form
    100,685.95/138,931.41 = 57,658.75/x
  3. Step 3: Cross multiply
    100,685.95x = 138,931.41 × 57,658.75
  4. Step 4: Simplify right side
    100,685.95x = 8,010,611,436.34
  5. Step 5: Solve for x
    x = 8,010,611,436.34/100,685.95
  6. Step 6: Final answer
    x = 79,560.37

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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.