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Finding the Fourth Proportional to 764.16, 1,053.30 and 689.64

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Solution

The fourth proportional to 764.16, 1,053.30 and 689.64 is: 950.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.16 : 1,053.30 = 689.64 : x
  2. Step 2: Convert to fraction form
    764.16/1,053.30 = 689.64/x
  3. Step 3: Cross multiply
    764.16x = 1,053.30 × 689.64
  4. Step 4: Simplify right side
    764.16x = 726,397.81
  5. Step 5: Solve for x
    x = 726,397.81/764.16
  6. Step 6: Final answer
    x = 950.58

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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.