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Finding the Fourth Proportional to 1,257.80, 1,886.22 and 488.12

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Solution

The fourth proportional to 1,257.80, 1,886.22 and 488.12 is: 731.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.80 : 1,886.22 = 488.12 : x
  2. Step 2: Convert to fraction form
    1,257.80/1,886.22 = 488.12/x
  3. Step 3: Cross multiply
    1,257.80x = 1,886.22 × 488.12
  4. Step 4: Simplify right side
    1,257.80x = 920,701.71
  5. Step 5: Solve for x
    x = 920,701.71/1,257.80
  6. Step 6: Final answer
    x = 731.99

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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.