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Finding the Fourth Proportional to 67,643.64, 93,348.72 and 40,780.80

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Solution

The fourth proportional to 67,643.64, 93,348.72 and 40,780.80 is: 56,277.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,643.64 : 93,348.72 = 40,780.80 : x
  2. Step 2: Convert to fraction form
    67,643.64/93,348.72 = 40,780.80/x
  3. Step 3: Cross multiply
    67,643.64x = 93,348.72 × 40,780.80
  4. Step 4: Simplify right side
    67,643.64x = 3,806,835,480.58
  5. Step 5: Solve for x
    x = 3,806,835,480.58/67,643.64
  6. Step 6: Final answer
    x = 56,277.80

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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.