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Finding the Fourth Proportional to 74,715.40, 112,073.10 and 57,219.40

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Solution

The fourth proportional to 74,715.40, 112,073.10 and 57,219.40 is: 85,829.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,715.40 : 112,073.10 = 57,219.40 : x
  2. Step 2: Convert to fraction form
    74,715.40/112,073.10 = 57,219.40/x
  3. Step 3: Cross multiply
    74,715.40x = 112,073.10 × 57,219.40
  4. Step 4: Simplify right side
    74,715.40x = 6,412,755,538.14
  5. Step 5: Solve for x
    x = 6,412,755,538.14/74,715.40
  6. Step 6: Final answer
    x = 85,829.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.