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Finding the Fourth Proportional to 749.30, 1,123.95 and 384.80

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Solution

The fourth proportional to 749.30, 1,123.95 and 384.80 is: 577.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.30 : 1,123.95 = 384.80 : x
  2. Step 2: Convert to fraction form
    749.30/1,123.95 = 384.80/x
  3. Step 3: Cross multiply
    749.30x = 1,123.95 × 384.80
  4. Step 4: Simplify right side
    749.30x = 432,495.96
  5. Step 5: Solve for x
    x = 432,495.96/749.30
  6. Step 6: Final answer
    x = 577.20

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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.