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Finding the Fourth Proportional to 129,936, 179,312.76 and 70,320

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Solution

The fourth proportional to 129,936, 179,312.76 and 70,320 is: 97,042.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,936 : 179,312.76 = 70,320 : x
  2. Step 2: Convert to fraction form
    129,936/179,312.76 = 70,320/x
  3. Step 3: Cross multiply
    129,936x = 179,312.76 × 70,320
  4. Step 4: Simplify right side
    129,936x = 12,609,273,283.20
  5. Step 5: Solve for x
    x = 12,609,273,283.20/129,936
  6. Step 6: Final answer
    x = 97,042.18

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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.