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Finding the Fourth Proportional to 749, 1,123.50 and 286.80

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Solution

The fourth proportional to 749, 1,123.50 and 286.80 is: 430.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    749 : 1,123.50 = 286.80 : x
  2. Step 2: Convert to fraction form
    749/1,123.50 = 286.80/x
  3. Step 3: Cross multiply
    749x = 1,123.50 × 286.80
  4. Step 4: Simplify right side
    749x = 322,219.80
  5. Step 5: Solve for x
    x = 322,219.80/749
  6. Step 6: Final answer
    x = 430.20

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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.