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Finding the Fourth Proportional to 874.86, 1,312.48 and 258.58

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Solution

The fourth proportional to 874.86, 1,312.48 and 258.58 is: 387.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.86 : 1,312.48 = 258.58 : x
  2. Step 2: Convert to fraction form
    874.86/1,312.48 = 258.58/x
  3. Step 3: Cross multiply
    874.86x = 1,312.48 × 258.58
  4. Step 4: Simplify right side
    874.86x = 339,381.08
  5. Step 5: Solve for x
    x = 339,381.08/874.86
  6. Step 6: Final answer
    x = 387.93

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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.