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Finding the Fourth Proportional to 80,989.30, 111,717.12 and 63,055.90

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Solution

The fourth proportional to 80,989.30, 111,717.12 and 63,055.90 is: 86,979.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,989.30 : 111,717.12 = 63,055.90 : x
  2. Step 2: Convert to fraction form
    80,989.30/111,717.12 = 63,055.90/x
  3. Step 3: Cross multiply
    80,989.30x = 111,717.12 × 63,055.90
  4. Step 4: Simplify right side
    80,989.30x = 7,044,423,547.01
  5. Step 5: Solve for x
    x = 7,044,423,547.01/80,989.30
  6. Step 6: Final answer
    x = 86,979.68

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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.