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Finding the Fourth Proportional to 66,370.20, 99,555.30 and 65,981.40

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Solution

The fourth proportional to 66,370.20, 99,555.30 and 65,981.40 is: 98,972.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,370.20 : 99,555.30 = 65,981.40 : x
  2. Step 2: Convert to fraction form
    66,370.20/99,555.30 = 65,981.40/x
  3. Step 3: Cross multiply
    66,370.20x = 99,555.30 × 65,981.40
  4. Step 4: Simplify right side
    66,370.20x = 6,568,798,071.42
  5. Step 5: Solve for x
    x = 6,568,798,071.42/66,370.20
  6. Step 6: Final answer
    x = 98,972.10

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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.