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Finding the Fourth Proportional to 66,100.81, 99,113.95 and 21,715.64

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Solution

The fourth proportional to 66,100.81, 99,113.95 and 21,715.64 is: 32,561.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,100.81 : 99,113.95 = 21,715.64 : x
  2. Step 2: Convert to fraction form
    66,100.81/99,113.95 = 21,715.64/x
  3. Step 3: Cross multiply
    66,100.81x = 99,113.95 × 21,715.64
  4. Step 4: Simplify right side
    66,100.81x = 2,152,323,283.14
  5. Step 5: Solve for x
    x = 2,152,323,283.14/66,100.81
  6. Step 6: Final answer
    x = 32,561.22

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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.