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Finding the Fourth Proportional to 109,663.61, 151,318.71 and 61,915.95

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Solution

The fourth proportional to 109,663.61, 151,318.71 and 61,915.95 is: 85,434.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,663.61 : 151,318.71 = 61,915.95 : x
  2. Step 2: Convert to fraction form
    109,663.61/151,318.71 = 61,915.95/x
  3. Step 3: Cross multiply
    109,663.61x = 151,318.71 × 61,915.95
  4. Step 4: Simplify right side
    109,663.61x = 9,369,041,682.42
  5. Step 5: Solve for x
    x = 9,369,041,682.42/109,663.61
  6. Step 6: Final answer
    x = 85,434.38

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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.