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Finding the Fourth Proportional to 749.40, 1,123.70 and 287.08

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Solution

The fourth proportional to 749.40, 1,123.70 and 287.08 is: 430.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.40 : 1,123.70 = 287.08 : x
  2. Step 2: Convert to fraction form
    749.40/1,123.70 = 287.08/x
  3. Step 3: Cross multiply
    749.40x = 1,123.70 × 287.08
  4. Step 4: Simplify right side
    749.40x = 322,595.49
  5. Step 5: Solve for x
    x = 322,595.49/749.40
  6. Step 6: Final answer
    x = 430.47

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1.5x scale

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.