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Finding the Fourth Proportional to 782.56, 1,079.88 and 472

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Solution

The fourth proportional to 782.56, 1,079.88 and 472 is: 651.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.56 : 1,079.88 = 472 : x
  2. Step 2: Convert to fraction form
    782.56/1,079.88 = 472/x
  3. Step 3: Cross multiply
    782.56x = 1,079.88 × 472
  4. Step 4: Simplify right side
    782.56x = 509,703.36
  5. Step 5: Solve for x
    x = 509,703.36/782.56
  6. Step 6: Final answer
    x = 651.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.