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Finding the Fourth Proportional to 912, 1,374.33 and 761.34

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Solution

The fourth proportional to 912, 1,374.33 and 761.34 is: 1,147.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    912 : 1,374.33 = 761.34 : x
  2. Step 2: Convert to fraction form
    912/1,374.33 = 761.34/x
  3. Step 3: Cross multiply
    912x = 1,374.33 × 761.34
  4. Step 4: Simplify right side
    912x = 1,046,332.40
  5. Step 5: Solve for x
    x = 1,046,332.40/912
  6. Step 6: Final answer
    x = 1,147.29

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.