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Finding the Fourth Proportional to 784.68, 1,177.17 and 316.19

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Solution

The fourth proportional to 784.68, 1,177.17 and 316.19 is: 474.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.68 : 1,177.17 = 316.19 : x
  2. Step 2: Convert to fraction form
    784.68/1,177.17 = 316.19/x
  3. Step 3: Cross multiply
    784.68x = 1,177.17 × 316.19
  4. Step 4: Simplify right side
    784.68x = 372,209.38
  5. Step 5: Solve for x
    x = 372,209.38/784.68
  6. Step 6: Final answer
    x = 474.35

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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.