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Finding the Fourth Proportional to 758.98, 1,047.28 and 422.88

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Solution

The fourth proportional to 758.98, 1,047.28 and 422.88 is: 583.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.98 : 1,047.28 = 422.88 : x
  2. Step 2: Convert to fraction form
    758.98/1,047.28 = 422.88/x
  3. Step 3: Cross multiply
    758.98x = 1,047.28 × 422.88
  4. Step 4: Simplify right side
    758.98x = 442,873.77
  5. Step 5: Solve for x
    x = 442,873.77/758.98
  6. Step 6: Final answer
    x = 583.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.