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Finding the Fourth Proportional to 803.56, 1,205.49 and 392.70

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Solution

The fourth proportional to 803.56, 1,205.49 and 392.70 is: 589.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.56 : 1,205.49 = 392.70 : x
  2. Step 2: Convert to fraction form
    803.56/1,205.49 = 392.70/x
  3. Step 3: Cross multiply
    803.56x = 1,205.49 × 392.70
  4. Step 4: Simplify right side
    803.56x = 473,395.92
  5. Step 5: Solve for x
    x = 473,395.92/803.56
  6. Step 6: Final answer
    x = 589.12

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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.