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Finding the Fourth Proportional to 758.86, 1,047.19 and 422.74

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Solution

The fourth proportional to 758.86, 1,047.19 and 422.74 is: 583.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.86 : 1,047.19 = 422.74 : x
  2. Step 2: Convert to fraction form
    758.86/1,047.19 = 422.74/x
  3. Step 3: Cross multiply
    758.86x = 1,047.19 × 422.74
  4. Step 4: Simplify right side
    758.86x = 442,689.10
  5. Step 5: Solve for x
    x = 442,689.10/758.86
  6. Step 6: Final answer
    x = 583.36

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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.