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Finding the Fourth Proportional to 66,648.90, 99,990.66 and 19,901.76

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Solution

The fourth proportional to 66,648.90, 99,990.66 and 19,901.76 is: 29,857.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,648.90 : 99,990.66 = 19,901.76 : x
  2. Step 2: Convert to fraction form
    66,648.90/99,990.66 = 19,901.76/x
  3. Step 3: Cross multiply
    66,648.90x = 99,990.66 × 19,901.76
  4. Step 4: Simplify right side
    66,648.90x = 1,989,990,117.56
  5. Step 5: Solve for x
    x = 1,989,990,117.56/66,648.90
  6. Step 6: Final answer
    x = 29,857.81

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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.