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Finding the Fourth Proportional to 874.94, 1,312.40 and 258.59

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Solution

The fourth proportional to 874.94, 1,312.40 and 258.59 is: 387.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.94 : 1,312.40 = 258.59 : x
  2. Step 2: Convert to fraction form
    874.94/1,312.40 = 258.59/x
  3. Step 3: Cross multiply
    874.94x = 1,312.40 × 258.59
  4. Step 4: Simplify right side
    874.94x = 339,377.44
  5. Step 5: Solve for x
    x = 339,377.44/874.94
  6. Step 6: Final answer
    x = 387.89

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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.