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Finding the Fourth Proportional to 749.10, 1,123.61 and 310.16

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Solution

The fourth proportional to 749.10, 1,123.61 and 310.16 is: 465.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.10 : 1,123.61 = 310.16 : x
  2. Step 2: Convert to fraction form
    749.10/1,123.61 = 310.16/x
  3. Step 3: Cross multiply
    749.10x = 1,123.61 × 310.16
  4. Step 4: Simplify right side
    749.10x = 348,491.71
  5. Step 5: Solve for x
    x = 348,491.71/749.10
  6. Step 6: Final answer
    x = 465.21

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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.