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Finding the Fourth Proportional to 109,318.80, 163,945.80 and 42,720.60

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Solution

The fourth proportional to 109,318.80, 163,945.80 and 42,720.60 is: 64,068.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,318.80 : 163,945.80 = 42,720.60 : x
  2. Step 2: Convert to fraction form
    109,318.80/163,945.80 = 42,720.60/x
  3. Step 3: Cross multiply
    109,318.80x = 163,945.80 × 42,720.60
  4. Step 4: Simplify right side
    109,318.80x = 7,003,862,943.48
  5. Step 5: Solve for x
    x = 7,003,862,943.48/109,318.80
  6. Step 6: Final answer
    x = 64,068.24

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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.