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Finding the Fourth Proportional to 74,715.60, 112,134.60 and 74,132.40

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Solution

The fourth proportional to 74,715.60, 112,134.60 and 74,132.40 is: 111,259.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,715.60 : 112,134.60 = 74,132.40 : x
  2. Step 2: Convert to fraction form
    74,715.60/112,134.60 = 74,132.40/x
  3. Step 3: Cross multiply
    74,715.60x = 112,134.60 × 74,132.40
  4. Step 4: Simplify right side
    74,715.60x = 8,312,807,021.04
  5. Step 5: Solve for x
    x = 8,312,807,021.04/74,715.60
  6. Step 6: Final answer
    x = 111,259.32

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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.