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Finding the Fourth Proportional to 813.65, 1,122.67 and 514.99

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Solution

The fourth proportional to 813.65, 1,122.67 and 514.99 is: 710.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.65 : 1,122.67 = 514.99 : x
  2. Step 2: Convert to fraction form
    813.65/1,122.67 = 514.99/x
  3. Step 3: Cross multiply
    813.65x = 1,122.67 × 514.99
  4. Step 4: Simplify right side
    813.65x = 578,158.76
  5. Step 5: Solve for x
    x = 578,158.76/813.65
  6. Step 6: Final answer
    x = 710.58

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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.