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Finding the Fourth Proportional to 72,934.40, 109,401.60 and 66,713.60

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Solution

The fourth proportional to 72,934.40, 109,401.60 and 66,713.60 is: 100,070.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,934.40 : 109,401.60 = 66,713.60 : x
  2. Step 2: Convert to fraction form
    72,934.40/109,401.60 = 66,713.60/x
  3. Step 3: Cross multiply
    72,934.40x = 109,401.60 × 66,713.60
  4. Step 4: Simplify right side
    72,934.40x = 7,298,574,581.76
  5. Step 5: Solve for x
    x = 7,298,574,581.76/72,934.40
  6. Step 6: Final answer
    x = 100,070.40

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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.