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Finding the Fourth Proportional to 77,263.62, 115,870.89 and 72,220.41

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Solution

The fourth proportional to 77,263.62, 115,870.89 and 72,220.41 is: 108,307.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,263.62 : 115,870.89 = 72,220.41 : x
  2. Step 2: Convert to fraction form
    77,263.62/115,870.89 = 72,220.41/x
  3. Step 3: Cross multiply
    77,263.62x = 115,870.89 × 72,220.41
  4. Step 4: Simplify right side
    77,263.62x = 8,368,243,182.86
  5. Step 5: Solve for x
    x = 8,368,243,182.86/77,263.62
  6. Step 6: Final answer
    x = 108,307.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.