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Finding the Fourth Proportional to 374.59, 561.40 and 258.85

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Solution

The fourth proportional to 374.59, 561.40 and 258.85 is: 387.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.59 : 561.40 = 258.85 : x
  2. Step 2: Convert to fraction form
    374.59/561.40 = 258.85/x
  3. Step 3: Cross multiply
    374.59x = 561.40 × 258.85
  4. Step 4: Simplify right side
    374.59x = 145,319.90
  5. Step 5: Solve for x
    x = 145,319.90/374.59
  6. Step 6: Final answer
    x = 387.94

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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.