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Finding the Fourth Proportional to 803.70, 1,108.62 and 655.56

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Solution

The fourth proportional to 803.70, 1,108.62 and 655.56 is: 904.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.70 : 1,108.62 = 655.56 : x
  2. Step 2: Convert to fraction form
    803.70/1,108.62 = 655.56/x
  3. Step 3: Cross multiply
    803.70x = 1,108.62 × 655.56
  4. Step 4: Simplify right side
    803.70x = 726,766.93
  5. Step 5: Solve for x
    x = 726,766.93/803.70
  6. Step 6: Final answer
    x = 904.28

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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.