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Finding the Fourth Proportional to 747.49, 1,120.48 and 285.15

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Solution

The fourth proportional to 747.49, 1,120.48 and 285.15 is: 427.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.49 : 1,120.48 = 285.15 : x
  2. Step 2: Convert to fraction form
    747.49/1,120.48 = 285.15/x
  3. Step 3: Cross multiply
    747.49x = 1,120.48 × 285.15
  4. Step 4: Simplify right side
    747.49x = 319,503.45
  5. Step 5: Solve for x
    x = 319,503.45/747.49
  6. Step 6: Final answer
    x = 427.44

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Double scale
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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.