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Finding the Fourth Proportional to 784.71, 1,177.21 and 322.74

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Solution

The fourth proportional to 784.71, 1,177.21 and 322.74 is: 484.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.71 : 1,177.21 = 322.74 : x
  2. Step 2: Convert to fraction form
    784.71/1,177.21 = 322.74/x
  3. Step 3: Cross multiply
    784.71x = 1,177.21 × 322.74
  4. Step 4: Simplify right side
    784.71x = 379,934.08
  5. Step 5: Solve for x
    x = 379,934.08/784.71
  6. Step 6: Final answer
    x = 484.17

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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.