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Finding the Fourth Proportional to 813.53, 1,122.12 and 498.69

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Solution

The fourth proportional to 813.53, 1,122.12 and 498.69 is: 687.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.53 : 1,122.12 = 498.69 : x
  2. Step 2: Convert to fraction form
    813.53/1,122.12 = 498.69/x
  3. Step 3: Cross multiply
    813.53x = 1,122.12 × 498.69
  4. Step 4: Simplify right side
    813.53x = 559,590.02
  5. Step 5: Solve for x
    x = 559,590.02/813.53
  6. Step 6: Final answer
    x = 687.85

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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.