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Finding the Fourth Proportional to 914.23, 1,370.13 and 426.21

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Solution

The fourth proportional to 914.23, 1,370.13 and 426.21 is: 638.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.23 : 1,370.13 = 426.21 : x
  2. Step 2: Convert to fraction form
    914.23/1,370.13 = 426.21/x
  3. Step 3: Cross multiply
    914.23x = 1,370.13 × 426.21
  4. Step 4: Simplify right side
    914.23x = 583,963.11
  5. Step 5: Solve for x
    x = 583,963.11/914.23
  6. Step 6: Final answer
    x = 638.75

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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.