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Finding the Fourth Proportional to 918.27, 1,376.28 and 430.65

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Solution

The fourth proportional to 918.27, 1,376.28 and 430.65 is: 645.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.27 : 1,376.28 = 430.65 : x
  2. Step 2: Convert to fraction form
    918.27/1,376.28 = 430.65/x
  3. Step 3: Cross multiply
    918.27x = 1,376.28 × 430.65
  4. Step 4: Simplify right side
    918.27x = 592,694.98
  5. Step 5: Solve for x
    x = 592,694.98/918.27
  6. Step 6: Final answer
    x = 645.45

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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.