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Finding the Fourth Proportional to 749.26, 1,128.78 and 587.67

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Solution

The fourth proportional to 749.26, 1,128.78 and 587.67 is: 885.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.26 : 1,128.78 = 587.67 : x
  2. Step 2: Convert to fraction form
    749.26/1,128.78 = 587.67/x
  3. Step 3: Cross multiply
    749.26x = 1,128.78 × 587.67
  4. Step 4: Simplify right side
    749.26x = 663,350.14
  5. Step 5: Solve for x
    x = 663,350.14/749.26
  6. Step 6: Final answer
    x = 885.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.