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Finding the Fourth Proportional to 129,699.90, 178,955.42 and 78,711.44

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Solution

The fourth proportional to 129,699.90, 178,955.42 and 78,711.44 is: 108,603.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,699.90 : 178,955.42 = 78,711.44 : x
  2. Step 2: Convert to fraction form
    129,699.90/178,955.42 = 78,711.44/x
  3. Step 3: Cross multiply
    129,699.90x = 178,955.42 × 78,711.44
  4. Step 4: Simplify right side
    129,699.90x = 14,085,837,515.67
  5. Step 5: Solve for x
    x = 14,085,837,515.67/129,699.90
  6. Step 6: Final answer
    x = 108,603.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.