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Finding the Fourth Proportional to 261,645.39, 392,468.49 and 74,656.89

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Solution

The fourth proportional to 261,645.39, 392,468.49 and 74,656.89 is: 111,985.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,645.39 : 392,468.49 = 74,656.89 : x
  2. Step 2: Convert to fraction form
    261,645.39/392,468.49 = 74,656.89/x
  3. Step 3: Cross multiply
    261,645.39x = 392,468.49 × 74,656.89
  4. Step 4: Simplify right side
    261,645.39x = 29,300,476,886.40
  5. Step 5: Solve for x
    x = 29,300,476,886.40/261,645.39
  6. Step 6: Final answer
    x = 111,985.45

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.