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Finding the Fourth Proportional to 129,703.77, 178,963.97 and 78,743.32

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Solution

The fourth proportional to 129,703.77, 178,963.97 and 78,743.32 is: 108,649.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,703.77 : 178,963.97 = 78,743.32 : x
  2. Step 2: Convert to fraction form
    129,703.77/178,963.97 = 78,743.32/x
  3. Step 3: Cross multiply
    129,703.77x = 178,963.97 × 78,743.32
  4. Step 4: Simplify right side
    129,703.77x = 14,092,217,158.18
  5. Step 5: Solve for x
    x = 14,092,217,158.18/129,703.77
  6. Step 6: Final answer
    x = 108,649.25

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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.