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Finding the Fourth Proportional to 813.24, 1,123.05 and 565.20

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Solution

The fourth proportional to 813.24, 1,123.05 and 565.20 is: 780.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.24 : 1,123.05 = 565.20 : x
  2. Step 2: Convert to fraction form
    813.24/1,123.05 = 565.20/x
  3. Step 3: Cross multiply
    813.24x = 1,123.05 × 565.20
  4. Step 4: Simplify right side
    813.24x = 634,747.86
  5. Step 5: Solve for x
    x = 634,747.86/813.24
  6. Step 6: Final answer
    x = 780.52

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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.