Home / 129,702.77-178,962.60-78,742.32

Finding the Fourth Proportional to 129,702.77, 178,962.60 and 78,742.32

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Solution

The fourth proportional to 129,702.77, 178,962.60 and 78,742.32 is: 108,647.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,702.77 : 178,962.60 = 78,742.32 : x
  2. Step 2: Convert to fraction form
    129,702.77/178,962.60 = 78,742.32/x
  3. Step 3: Cross multiply
    129,702.77x = 178,962.60 × 78,742.32
  4. Step 4: Simplify right side
    129,702.77x = 14,091,929,923.52
  5. Step 5: Solve for x
    x = 14,091,929,923.52/129,702.77
  6. Step 6: Final answer
    x = 108,647.88

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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.