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Finding the Fourth Proportional to 986.85, 1,480.70 and 370.49

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Solution

The fourth proportional to 986.85, 1,480.70 and 370.49 is: 555.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.85 : 1,480.70 = 370.49 : x
  2. Step 2: Convert to fraction form
    986.85/1,480.70 = 370.49/x
  3. Step 3: Cross multiply
    986.85x = 1,480.70 × 370.49
  4. Step 4: Simplify right side
    986.85x = 548,575.29
  5. Step 5: Solve for x
    x = 548,575.29/986.85
  6. Step 6: Final answer
    x = 555.89

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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.