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Finding the Fourth Proportional to 762.47, 1,053.20 and 563.70

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Solution

The fourth proportional to 762.47, 1,053.20 and 563.70 is: 778.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.47 : 1,053.20 = 563.70 : x
  2. Step 2: Convert to fraction form
    762.47/1,053.20 = 563.70/x
  3. Step 3: Cross multiply
    762.47x = 1,053.20 × 563.70
  4. Step 4: Simplify right side
    762.47x = 593,686.02
  5. Step 5: Solve for x
    x = 593,686.02/762.47
  6. Step 6: Final answer
    x = 778.63

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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.