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Finding the Fourth Proportional to 1,252.43, 1,878.68 and 430.69

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Solution

The fourth proportional to 1,252.43, 1,878.68 and 430.69 is: 646.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.43 : 1,878.68 = 430.69 : x
  2. Step 2: Convert to fraction form
    1,252.43/1,878.68 = 430.69/x
  3. Step 3: Cross multiply
    1,252.43x = 1,878.68 × 430.69
  4. Step 4: Simplify right side
    1,252.43x = 809,128.69
  5. Step 5: Solve for x
    x = 809,128.69/1,252.43
  6. Step 6: Final answer
    x = 646.05

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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.