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Finding the Fourth Proportional to 118,290.80, 163,419.36 and 77,551.72

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Solution

The fourth proportional to 118,290.80, 163,419.36 and 77,551.72 is: 107,138.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,290.80 : 163,419.36 = 77,551.72 : x
  2. Step 2: Convert to fraction form
    118,290.80/163,419.36 = 77,551.72/x
  3. Step 3: Cross multiply
    118,290.80x = 163,419.36 × 77,551.72
  4. Step 4: Simplify right side
    118,290.80x = 12,673,452,449.30
  5. Step 5: Solve for x
    x = 12,673,452,449.30/118,290.80
  6. Step 6: Final answer
    x = 107,138.11

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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.