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Finding the Fourth Proportional to 942.90, 1,301.31 and 912.66

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Solution

The fourth proportional to 942.90, 1,301.31 and 912.66 is: 1,259.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.90 : 1,301.31 = 912.66 : x
  2. Step 2: Convert to fraction form
    942.90/1,301.31 = 912.66/x
  3. Step 3: Cross multiply
    942.90x = 1,301.31 × 912.66
  4. Step 4: Simplify right side
    942.90x = 1,187,653.58
  5. Step 5: Solve for x
    x = 1,187,653.58/942.90
  6. Step 6: Final answer
    x = 1,259.58

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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.