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Finding the Fourth Proportional to 782.72, 1,172.66 and 474.68

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Solution

The fourth proportional to 782.72, 1,172.66 and 474.68 is: 711.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.72 : 1,172.66 = 474.68 : x
  2. Step 2: Convert to fraction form
    782.72/1,172.66 = 474.68/x
  3. Step 3: Cross multiply
    782.72x = 1,172.66 × 474.68
  4. Step 4: Simplify right side
    782.72x = 556,638.25
  5. Step 5: Solve for x
    x = 556,638.25/782.72
  6. Step 6: Final answer
    x = 711.16

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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.