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Finding the Fourth Proportional to 77,011.61, 106,819.71 and 74,963.31

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Solution

The fourth proportional to 77,011.61, 106,819.71 and 74,963.31 is: 103,978.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,011.61 : 106,819.71 = 74,963.31 : x
  2. Step 2: Convert to fraction form
    77,011.61/106,819.71 = 74,963.31/x
  3. Step 3: Cross multiply
    77,011.61x = 106,819.71 × 74,963.31
  4. Step 4: Simplify right side
    77,011.61x = 8,007,559,034.84
  5. Step 5: Solve for x
    x = 8,007,559,034.84/77,011.61
  6. Step 6: Final answer
    x = 103,978.60

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.