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Finding the Fourth Proportional to 749.81, 1,034.78 and 418.28

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Solution

The fourth proportional to 749.81, 1,034.78 and 418.28 is: 577.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.81 : 1,034.78 = 418.28 : x
  2. Step 2: Convert to fraction form
    749.81/1,034.78 = 418.28/x
  3. Step 3: Cross multiply
    749.81x = 1,034.78 × 418.28
  4. Step 4: Simplify right side
    749.81x = 432,831.16
  5. Step 5: Solve for x
    x = 432,831.16/749.81
  6. Step 6: Final answer
    x = 577.26

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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.