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Finding the Fourth Proportional to 929.42, 1,392.80 and 616.56

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Solution

The fourth proportional to 929.42, 1,392.80 and 616.56 is: 923.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.42 : 1,392.80 = 616.56 : x
  2. Step 2: Convert to fraction form
    929.42/1,392.80 = 616.56/x
  3. Step 3: Cross multiply
    929.42x = 1,392.80 × 616.56
  4. Step 4: Simplify right side
    929.42x = 858,744.77
  5. Step 5: Solve for x
    x = 858,744.77/929.42
  6. Step 6: Final answer
    x = 923.96

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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.