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Finding the Fourth Proportional to 764.64, 1,053.41 and 630.99

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Solution

The fourth proportional to 764.64, 1,053.41 and 630.99 is: 869.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.64 : 1,053.41 = 630.99 : x
  2. Step 2: Convert to fraction form
    764.64/1,053.41 = 630.99/x
  3. Step 3: Cross multiply
    764.64x = 1,053.41 × 630.99
  4. Step 4: Simplify right side
    764.64x = 664,688.02
  5. Step 5: Solve for x
    x = 664,688.02/764.64
  6. Step 6: Final answer
    x = 869.28

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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.