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Finding the Fourth Proportional to 784.40, 1,175.72 and 322.16

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Solution

The fourth proportional to 784.40, 1,175.72 and 322.16 is: 482.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.40 : 1,175.72 = 322.16 : x
  2. Step 2: Convert to fraction form
    784.40/1,175.72 = 322.16/x
  3. Step 3: Cross multiply
    784.40x = 1,175.72 × 322.16
  4. Step 4: Simplify right side
    784.40x = 378,769.96
  5. Step 5: Solve for x
    x = 378,769.96/784.40
  6. Step 6: Final answer
    x = 482.88

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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.