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Finding the Fourth Proportional to 610.60, 914.85 and 391.45

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Solution

The fourth proportional to 610.60, 914.85 and 391.45 is: 586.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.60 : 914.85 = 391.45 : x
  2. Step 2: Convert to fraction form
    610.60/914.85 = 391.45/x
  3. Step 3: Cross multiply
    610.60x = 914.85 × 391.45
  4. Step 4: Simplify right side
    610.60x = 358,118.03
  5. Step 5: Solve for x
    x = 358,118.03/610.60
  6. Step 6: Final answer
    x = 586.50

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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.