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Finding the Fourth Proportional to 101,995.61, 140,776.79 and 56,689.47

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Solution

The fourth proportional to 101,995.61, 140,776.79 and 56,689.47 is: 78,244.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,995.61 : 140,776.79 = 56,689.47 : x
  2. Step 2: Convert to fraction form
    101,995.61/140,776.79 = 56,689.47/x
  3. Step 3: Cross multiply
    101,995.61x = 140,776.79 × 56,689.47
  4. Step 4: Simplify right side
    101,995.61x = 7,980,561,329.95
  5. Step 5: Solve for x
    x = 7,980,561,329.95/101,995.61
  6. Step 6: Final answer
    x = 78,244.17

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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.