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Finding the Fourth Proportional to 699.13, 1,045.23 and 545.20

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Solution

The fourth proportional to 699.13, 1,045.23 and 545.20 is: 815.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.13 : 1,045.23 = 545.20 : x
  2. Step 2: Convert to fraction form
    699.13/1,045.23 = 545.20/x
  3. Step 3: Cross multiply
    699.13x = 1,045.23 × 545.20
  4. Step 4: Simplify right side
    699.13x = 569,859.40
  5. Step 5: Solve for x
    x = 569,859.40/699.13
  6. Step 6: Final answer
    x = 815.10

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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.