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Finding the Fourth Proportional to 874.96, 1,312.29 and 258.66

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Solution

The fourth proportional to 874.96, 1,312.29 and 258.66 is: 387.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.96 : 1,312.29 = 258.66 : x
  2. Step 2: Convert to fraction form
    874.96/1,312.29 = 258.66/x
  3. Step 3: Cross multiply
    874.96x = 1,312.29 × 258.66
  4. Step 4: Simplify right side
    874.96x = 339,436.93
  5. Step 5: Solve for x
    x = 339,436.93/874.96
  6. Step 6: Final answer
    x = 387.95

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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.