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Finding the Fourth Proportional to 1,252.21, 1,878.72 and 430.46

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Solution

The fourth proportional to 1,252.21, 1,878.72 and 430.46 is: 645.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.21 : 1,878.72 = 430.46 : x
  2. Step 2: Convert to fraction form
    1,252.21/1,878.72 = 430.46/x
  3. Step 3: Cross multiply
    1,252.21x = 1,878.72 × 430.46
  4. Step 4: Simplify right side
    1,252.21x = 808,711.66
  5. Step 5: Solve for x
    x = 808,711.66/1,252.21
  6. Step 6: Final answer
    x = 645.83

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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.