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Finding the Fourth Proportional to 287,877.38, 431,712.39 and 121,678.34

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Solution

The fourth proportional to 287,877.38, 431,712.39 and 121,678.34 is: 182,473.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,877.38 : 431,712.39 = 121,678.34 : x
  2. Step 2: Convert to fraction form
    287,877.38/431,712.39 = 121,678.34/x
  3. Step 3: Cross multiply
    287,877.38x = 431,712.39 × 121,678.34
  4. Step 4: Simplify right side
    287,877.38x = 52,530,046,972.63
  5. Step 5: Solve for x
    x = 52,530,046,972.63/287,877.38
  6. Step 6: Final answer
    x = 182,473.69

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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.