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Finding the Fourth Proportional to 123,631.84, 170,652.18 and 72,643.69

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Solution

The fourth proportional to 123,631.84, 170,652.18 and 72,643.69 is: 100,271.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,631.84 : 170,652.18 = 72,643.69 : x
  2. Step 2: Convert to fraction form
    123,631.84/170,652.18 = 72,643.69/x
  3. Step 3: Cross multiply
    123,631.84x = 170,652.18 × 72,643.69
  4. Step 4: Simplify right side
    123,631.84x = 12,396,804,061.74
  5. Step 5: Solve for x
    x = 12,396,804,061.74/123,631.84
  6. Step 6: Final answer
    x = 100,271.94

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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.