Home / 78,702.56-118,071.38-28,781.55

Finding the Fourth Proportional to 78,702.56, 118,071.38 and 28,781.55

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Solution

The fourth proportional to 78,702.56, 118,071.38 and 28,781.55 is: 43,178.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,702.56 : 118,071.38 = 28,781.55 : x
  2. Step 2: Convert to fraction form
    78,702.56/118,071.38 = 28,781.55/x
  3. Step 3: Cross multiply
    78,702.56x = 118,071.38 × 28,781.55
  4. Step 4: Simplify right side
    78,702.56x = 3,398,277,327.04
  5. Step 5: Solve for x
    x = 3,398,277,327.04/78,702.56
  6. Step 6: Final answer
    x = 43,178.74

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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.