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Finding the Fourth Proportional to 100,964.61, 139,306.70 and 57,347.46

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Solution

The fourth proportional to 100,964.61, 139,306.70 and 57,347.46 is: 79,125.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,964.61 : 139,306.70 = 57,347.46 : x
  2. Step 2: Convert to fraction form
    100,964.61/139,306.70 = 57,347.46/x
  3. Step 3: Cross multiply
    100,964.61x = 139,306.70 × 57,347.46
  4. Step 4: Simplify right side
    100,964.61x = 7,988,885,119.24
  5. Step 5: Solve for x
    x = 7,988,885,119.24/100,964.61
  6. Step 6: Final answer
    x = 79,125.60

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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.