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Finding the Fourth Proportional to 990.48, 1,482.60 and 680.52

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Solution

The fourth proportional to 990.48, 1,482.60 and 680.52 is: 1,018.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.48 : 1,482.60 = 680.52 : x
  2. Step 2: Convert to fraction form
    990.48/1,482.60 = 680.52/x
  3. Step 3: Cross multiply
    990.48x = 1,482.60 × 680.52
  4. Step 4: Simplify right side
    990.48x = 1,008,938.95
  5. Step 5: Solve for x
    x = 1,008,938.95/990.48
  6. Step 6: Final answer
    x = 1,018.64

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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.