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Finding the Fourth Proportional to 431,147.40, 646,721.10 and 431,147.40

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Solution

The fourth proportional to 431,147.40, 646,721.10 and 431,147.40 is: 646,721.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,147.40 : 646,721.10 = 431,147.40 : x
  2. Step 2: Convert to fraction form
    431,147.40/646,721.10 = 431,147.40/x
  3. Step 3: Cross multiply
    431,147.40x = 646,721.10 × 431,147.40
  4. Step 4: Simplify right side
    431,147.40x = 278,832,120,790.14
  5. Step 5: Solve for x
    x = 278,832,120,790.14/431,147.40
  6. Step 6: Final answer
    x = 646,721.10

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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.