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Finding the Fourth Proportional to 258,432.59, 387,648.65 and 80,953.45

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Solution

The fourth proportional to 258,432.59, 387,648.65 and 80,953.45 is: 121,430.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,432.59 : 387,648.65 = 80,953.45 : x
  2. Step 2: Convert to fraction form
    258,432.59/387,648.65 = 80,953.45/x
  3. Step 3: Cross multiply
    258,432.59x = 387,648.65 × 80,953.45
  4. Step 4: Simplify right side
    258,432.59x = 31,381,494,838.60
  5. Step 5: Solve for x
    x = 31,381,494,838.60/258,432.59
  6. Step 6: Final answer
    x = 121,430.10

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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.