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Finding the Fourth Proportional to 78,643.60, 118,195.80 and 77,261.20

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Solution

The fourth proportional to 78,643.60, 118,195.80 and 77,261.20 is: 116,118.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,643.60 : 118,195.80 = 77,261.20 : x
  2. Step 2: Convert to fraction form
    78,643.60/118,195.80 = 77,261.20/x
  3. Step 3: Cross multiply
    78,643.60x = 118,195.80 × 77,261.20
  4. Step 4: Simplify right side
    78,643.60x = 9,131,949,342.96
  5. Step 5: Solve for x
    x = 9,131,949,342.96/78,643.60
  6. Step 6: Final answer
    x = 116,118.15

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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.