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Finding the Fourth Proportional to 129,601, 178,849.38 and 69,985

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Solution

The fourth proportional to 129,601, 178,849.38 and 69,985 is: 96,579.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,601 : 178,849.38 = 69,985 : x
  2. Step 2: Convert to fraction form
    129,601/178,849.38 = 69,985/x
  3. Step 3: Cross multiply
    129,601x = 178,849.38 × 69,985
  4. Step 4: Simplify right side
    129,601x = 12,516,773,859.30
  5. Step 5: Solve for x
    x = 12,516,773,859.30/129,601
  6. Step 6: Final answer
    x = 96,579.30

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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.