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Finding the Fourth Proportional to 78,700.80, 118,051.20 and 28,764.30

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Solution

The fourth proportional to 78,700.80, 118,051.20 and 28,764.30 is: 43,146.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,700.80 : 118,051.20 = 28,764.30 : x
  2. Step 2: Convert to fraction form
    78,700.80/118,051.20 = 28,764.30/x
  3. Step 3: Cross multiply
    78,700.80x = 118,051.20 × 28,764.30
  4. Step 4: Simplify right side
    78,700.80x = 3,395,660,132.16
  5. Step 5: Solve for x
    x = 3,395,660,132.16/78,700.80
  6. Step 6: Final answer
    x = 43,146.45

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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.