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Finding the Fourth Proportional to 929.78, 1,395.35 and 749.36

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Solution

The fourth proportional to 929.78, 1,395.35 and 749.36 is: 1,124.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.78 : 1,395.35 = 749.36 : x
  2. Step 2: Convert to fraction form
    929.78/1,395.35 = 749.36/x
  3. Step 3: Cross multiply
    929.78x = 1,395.35 × 749.36
  4. Step 4: Simplify right side
    929.78x = 1,045,619.48
  5. Step 5: Solve for x
    x = 1,045,619.48/929.78
  6. Step 6: Final answer
    x = 1,124.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.