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Finding the Fourth Proportional to 1,252.44, 1,878.24 and 430.69

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Solution

The fourth proportional to 1,252.44, 1,878.24 and 430.69 is: 645.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.44 : 1,878.24 = 430.69 : x
  2. Step 2: Convert to fraction form
    1,252.44/1,878.24 = 430.69/x
  3. Step 3: Cross multiply
    1,252.44x = 1,878.24 × 430.69
  4. Step 4: Simplify right side
    1,252.44x = 808,939.19
  5. Step 5: Solve for x
    x = 808,939.19/1,252.44
  6. Step 6: Final answer
    x = 645.89

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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.