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Finding the Fourth Proportional to 961.72, 1,442.58 and 619

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Solution

The fourth proportional to 961.72, 1,442.58 and 619 is: 928.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.72 : 1,442.58 = 619 : x
  2. Step 2: Convert to fraction form
    961.72/1,442.58 = 619/x
  3. Step 3: Cross multiply
    961.72x = 1,442.58 × 619
  4. Step 4: Simplify right side
    961.72x = 892,957.02
  5. Step 5: Solve for x
    x = 892,957.02/961.72
  6. Step 6: Final answer
    x = 928.50

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Double scale
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Similar ratio
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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.