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Finding the Fourth Proportional to 918.79, 1,376.97 and 430.82

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Solution

The fourth proportional to 918.79, 1,376.97 and 430.82 is: 645.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.79 : 1,376.97 = 430.82 : x
  2. Step 2: Convert to fraction form
    918.79/1,376.97 = 430.82/x
  3. Step 3: Cross multiply
    918.79x = 1,376.97 × 430.82
  4. Step 4: Simplify right side
    918.79x = 593,222.88
  5. Step 5: Solve for x
    x = 593,222.88/918.79
  6. Step 6: Final answer
    x = 645.65

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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.