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Finding the Fourth Proportional to 287,403.54, 431,105.39 and 87,725.06

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Solution

The fourth proportional to 287,403.54, 431,105.39 and 87,725.06 is: 131,587.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,403.54 : 431,105.39 = 87,725.06 : x
  2. Step 2: Convert to fraction form
    287,403.54/431,105.39 = 87,725.06/x
  3. Step 3: Cross multiply
    287,403.54x = 431,105.39 × 87,725.06
  4. Step 4: Simplify right side
    287,403.54x = 37,818,746,204.07
  5. Step 5: Solve for x
    x = 37,818,746,204.07/287,403.54
  6. Step 6: Final answer
    x = 131,587.61

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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.