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Finding the Fourth Proportional to 764.27, 1,055.21 and 565.14

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Solution

The fourth proportional to 764.27, 1,055.21 and 565.14 is: 780.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.27 : 1,055.21 = 565.14 : x
  2. Step 2: Convert to fraction form
    764.27/1,055.21 = 565.14/x
  3. Step 3: Cross multiply
    764.27x = 1,055.21 × 565.14
  4. Step 4: Simplify right side
    764.27x = 596,341.38
  5. Step 5: Solve for x
    x = 596,341.38/764.27
  6. Step 6: Final answer
    x = 780.28

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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.