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Finding the Fourth Proportional to 78,915.61, 108,900.78 and 44,921.53

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Solution

The fourth proportional to 78,915.61, 108,900.78 and 44,921.53 is: 61,990.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,915.61 : 108,900.78 = 44,921.53 : x
  2. Step 2: Convert to fraction form
    78,915.61/108,900.78 = 44,921.53/x
  3. Step 3: Cross multiply
    78,915.61x = 108,900.78 × 44,921.53
  4. Step 4: Simplify right side
    78,915.61x = 4,891,989,655.79
  5. Step 5: Solve for x
    x = 4,891,989,655.79/78,915.61
  6. Step 6: Final answer
    x = 61,990.14

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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.