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Finding the Fourth Proportional to 73,139.40, 109,709.10 and 64,974.60

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Solution

The fourth proportional to 73,139.40, 109,709.10 and 64,974.60 is: 97,461.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,139.40 : 109,709.10 = 64,974.60 : x
  2. Step 2: Convert to fraction form
    73,139.40/109,709.10 = 64,974.60/x
  3. Step 3: Cross multiply
    73,139.40x = 109,709.10 × 64,974.60
  4. Step 4: Simplify right side
    73,139.40x = 7,128,304,888.86
  5. Step 5: Solve for x
    x = 7,128,304,888.86/73,139.40
  6. Step 6: Final answer
    x = 97,461.90

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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.