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Finding the Fourth Proportional to 874.85, 1,312.30 and 258.57

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Solution

The fourth proportional to 874.85, 1,312.30 and 258.57 is: 387.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.85 : 1,312.30 = 258.57 : x
  2. Step 2: Convert to fraction form
    874.85/1,312.30 = 258.57/x
  3. Step 3: Cross multiply
    874.85x = 1,312.30 × 258.57
  4. Step 4: Simplify right side
    874.85x = 339,320.76
  5. Step 5: Solve for x
    x = 339,320.76/874.85
  6. Step 6: Final answer
    x = 387.86

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1.5x scale

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.