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Finding the Fourth Proportional to 123,710.81, 170,798.19 and 85,015.28

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Solution

The fourth proportional to 123,710.81, 170,798.19 and 85,015.28 is: 117,374.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,710.81 : 170,798.19 = 85,015.28 : x
  2. Step 2: Convert to fraction form
    123,710.81/170,798.19 = 85,015.28/x
  3. Step 3: Cross multiply
    123,710.81x = 170,798.19 × 85,015.28
  4. Step 4: Simplify right side
    123,710.81x = 14,520,456,373.34
  5. Step 5: Solve for x
    x = 14,520,456,373.34/123,710.81
  6. Step 6: Final answer
    x = 117,374.20

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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.