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Finding the Fourth Proportional to 66,465.72, 99,699.18 and 19,718.60

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Solution

The fourth proportional to 66,465.72, 99,699.18 and 19,718.60 is: 29,578.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,465.72 : 99,699.18 = 19,718.60 : x
  2. Step 2: Convert to fraction form
    66,465.72/99,699.18 = 19,718.60/x
  3. Step 3: Cross multiply
    66,465.72x = 99,699.18 × 19,718.60
  4. Step 4: Simplify right side
    66,465.72x = 1,965,928,250.75
  5. Step 5: Solve for x
    x = 1,965,928,250.75/66,465.72
  6. Step 6: Final answer
    x = 29,578.08

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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.