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Finding the Fourth Proportional to 78,127.48, 117,191.27 and 18,963.20

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Solution

The fourth proportional to 78,127.48, 117,191.27 and 18,963.20 is: 28,444.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,127.48 : 117,191.27 = 18,963.20 : x
  2. Step 2: Convert to fraction form
    78,127.48/117,191.27 = 18,963.20/x
  3. Step 3: Cross multiply
    78,127.48x = 117,191.27 × 18,963.20
  4. Step 4: Simplify right side
    78,127.48x = 2,222,321,831.65
  5. Step 5: Solve for x
    x = 2,222,321,831.65/78,127.48
  6. Step 6: Final answer
    x = 28,444.82

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1.5x scale

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.