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Finding the Fourth Proportional to 803.93, 1,206.29 and 392.99

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Solution

The fourth proportional to 803.93, 1,206.29 and 392.99 is: 589.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.93 : 1,206.29 = 392.99 : x
  2. Step 2: Convert to fraction form
    803.93/1,206.29 = 392.99/x
  3. Step 3: Cross multiply
    803.93x = 1,206.29 × 392.99
  4. Step 4: Simplify right side
    803.93x = 474,054.86
  5. Step 5: Solve for x
    x = 474,054.86/803.93
  6. Step 6: Final answer
    x = 589.68

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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.