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Finding the Fourth Proportional to 813.99, 1,123.60 and 482.42

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Solution

The fourth proportional to 813.99, 1,123.60 and 482.42 is: 665.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.99 : 1,123.60 = 482.42 : x
  2. Step 2: Convert to fraction form
    813.99/1,123.60 = 482.42/x
  3. Step 3: Cross multiply
    813.99x = 1,123.60 × 482.42
  4. Step 4: Simplify right side
    813.99x = 542,048.71
  5. Step 5: Solve for x
    x = 542,048.71/813.99
  6. Step 6: Final answer
    x = 665.92

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.