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Finding the Fourth Proportional to 990.98, 1,486.48 and 260.48

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Solution

The fourth proportional to 990.98, 1,486.48 and 260.48 is: 390.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.98 : 1,486.48 = 260.48 : x
  2. Step 2: Convert to fraction form
    990.98/1,486.48 = 260.48/x
  3. Step 3: Cross multiply
    990.98x = 1,486.48 × 260.48
  4. Step 4: Simplify right side
    990.98x = 387,198.31
  5. Step 5: Solve for x
    x = 387,198.31/990.98
  6. Step 6: Final answer
    x = 390.72

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Double scale
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Similar ratio
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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.