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Finding the Fourth Proportional to 918.22, 1,376.07 and 430.42

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Solution

The fourth proportional to 918.22, 1,376.07 and 430.42 is: 645.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.22 : 1,376.07 = 430.42 : x
  2. Step 2: Convert to fraction form
    918.22/1,376.07 = 430.42/x
  3. Step 3: Cross multiply
    918.22x = 1,376.07 × 430.42
  4. Step 4: Simplify right side
    918.22x = 592,288.05
  5. Step 5: Solve for x
    x = 592,288.05/918.22
  6. Step 6: Final answer
    x = 645.04

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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.