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Finding the Fourth Proportional to 1,138.23, 1,570.41 and 695.66

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Solution

The fourth proportional to 1,138.23, 1,570.41 and 695.66 is: 959.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.23 : 1,570.41 = 695.66 : x
  2. Step 2: Convert to fraction form
    1,138.23/1,570.41 = 695.66/x
  3. Step 3: Cross multiply
    1,138.23x = 1,570.41 × 695.66
  4. Step 4: Simplify right side
    1,138.23x = 1,092,471.42
  5. Step 5: Solve for x
    x = 1,092,471.42/1,138.23
  6. Step 6: Final answer
    x = 959.80

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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.