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Finding the Fourth Proportional to 129,931, 179,304.78 and 70,315

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Solution

The fourth proportional to 129,931, 179,304.78 and 70,315 is: 97,034.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,931 : 179,304.78 = 70,315 : x
  2. Step 2: Convert to fraction form
    129,931/179,304.78 = 70,315/x
  3. Step 3: Cross multiply
    129,931x = 179,304.78 × 70,315
  4. Step 4: Simplify right side
    129,931x = 12,607,815,605.70
  5. Step 5: Solve for x
    x = 12,607,815,605.70/129,931
  6. Step 6: Final answer
    x = 97,034.70

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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.