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Finding the Fourth Proportional to 78,491.40, 117,737.10 and 73,307.40

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Solution

The fourth proportional to 78,491.40, 117,737.10 and 73,307.40 is: 109,961.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,491.40 : 117,737.10 = 73,307.40 : x
  2. Step 2: Convert to fraction form
    78,491.40/117,737.10 = 73,307.40/x
  3. Step 3: Cross multiply
    78,491.40x = 117,737.10 × 73,307.40
  4. Step 4: Simplify right side
    78,491.40x = 8,631,000,684.54
  5. Step 5: Solve for x
    x = 8,631,000,684.54/78,491.40
  6. Step 6: Final answer
    x = 109,961.10

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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.