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Finding the Fourth Proportional to 112,122.72, 154,808.40 and 71,940

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Solution

The fourth proportional to 112,122.72, 154,808.40 and 71,940 is: 99,327.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,122.72 : 154,808.40 = 71,940 : x
  2. Step 2: Convert to fraction form
    112,122.72/154,808.40 = 71,940/x
  3. Step 3: Cross multiply
    112,122.72x = 154,808.40 × 71,940
  4. Step 4: Simplify right side
    112,122.72x = 11,136,916,296
  5. Step 5: Solve for x
    x = 11,136,916,296/112,122.72
  6. Step 6: Final answer
    x = 99,327.92

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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.