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Finding the Fourth Proportional to 87,445.86, 130,486.78 and 78,021.09

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Solution

The fourth proportional to 87,445.86, 130,486.78 and 78,021.09 is: 116,423.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,445.86 : 130,486.78 = 78,021.09 : x
  2. Step 2: Convert to fraction form
    87,445.86/130,486.78 = 78,021.09/x
  3. Step 3: Cross multiply
    87,445.86x = 130,486.78 × 78,021.09
  4. Step 4: Simplify right side
    87,445.86x = 10,180,721,132.41
  5. Step 5: Solve for x
    x = 10,180,721,132.41/87,445.86
  6. Step 6: Final answer
    x = 116,423.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.