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Finding the Fourth Proportional to 800.49, 1,102.47 and 689.93

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Solution

The fourth proportional to 800.49, 1,102.47 and 689.93 is: 950.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.49 : 1,102.47 = 689.93 : x
  2. Step 2: Convert to fraction form
    800.49/1,102.47 = 689.93/x
  3. Step 3: Cross multiply
    800.49x = 1,102.47 × 689.93
  4. Step 4: Simplify right side
    800.49x = 760,621.61
  5. Step 5: Solve for x
    x = 760,621.61/800.49
  6. Step 6: Final answer
    x = 950.20

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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.