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Finding the Fourth Proportional to 66,686.83, 99,887.67 and 53,981.71

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Solution

The fourth proportional to 66,686.83, 99,887.67 and 53,981.71 is: 80,857.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,686.83 : 99,887.67 = 53,981.71 : x
  2. Step 2: Convert to fraction form
    66,686.83/99,887.67 = 53,981.71/x
  3. Step 3: Cross multiply
    66,686.83x = 99,887.67 × 53,981.71
  4. Step 4: Simplify right side
    66,686.83x = 5,392,106,984.80
  5. Step 5: Solve for x
    x = 5,392,106,984.80/66,686.83
  6. Step 6: Final answer
    x = 80,857.15

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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.