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Finding the Fourth Proportional to 78,911, 108,897.18 and 45,377

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Solution

The fourth proportional to 78,911, 108,897.18 and 45,377 is: 62,620.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,911 : 108,897.18 = 45,377 : x
  2. Step 2: Convert to fraction form
    78,911/108,897.18 = 45,377/x
  3. Step 3: Cross multiply
    78,911x = 108,897.18 × 45,377
  4. Step 4: Simplify right side
    78,911x = 4,941,427,336.86
  5. Step 5: Solve for x
    x = 4,941,427,336.86/78,911
  6. Step 6: Final answer
    x = 62,620.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.