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Finding the Fourth Proportional to 100,798.64, 139,044.26 and 63,007.28

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Solution

The fourth proportional to 100,798.64, 139,044.26 and 63,007.28 is: 86,913.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,798.64 : 139,044.26 = 63,007.28 : x
  2. Step 2: Convert to fraction form
    100,798.64/139,044.26 = 63,007.28/x
  3. Step 3: Cross multiply
    100,798.64x = 139,044.26 × 63,007.28
  4. Step 4: Simplify right side
    100,798.64x = 8,760,800,605.93
  5. Step 5: Solve for x
    x = 8,760,800,605.93/100,798.64
  6. Step 6: Final answer
    x = 86,913.88

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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.