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Finding the Fourth Proportional to 78,710.80, 118,066.20 and 43,281.40

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Solution

The fourth proportional to 78,710.80, 118,066.20 and 43,281.40 is: 64,922.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,710.80 : 118,066.20 = 43,281.40 : x
  2. Step 2: Convert to fraction form
    78,710.80/118,066.20 = 43,281.40/x
  3. Step 3: Cross multiply
    78,710.80x = 118,066.20 × 43,281.40
  4. Step 4: Simplify right side
    78,710.80x = 5,110,070,428.68
  5. Step 5: Solve for x
    x = 5,110,070,428.68/78,710.80
  6. Step 6: Final answer
    x = 64,922.10

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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.