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Finding the Fourth Proportional to 129,672, 178,947.36 and 70,056

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Solution

The fourth proportional to 129,672, 178,947.36 and 70,056 is: 96,677.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,672 : 178,947.36 = 70,056 : x
  2. Step 2: Convert to fraction form
    129,672/178,947.36 = 70,056/x
  3. Step 3: Cross multiply
    129,672x = 178,947.36 × 70,056
  4. Step 4: Simplify right side
    129,672x = 12,536,336,252.16
  5. Step 5: Solve for x
    x = 12,536,336,252.16/129,672
  6. Step 6: Final answer
    x = 96,677.28

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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.