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Finding the Fourth Proportional to 990.47, 1,484.51 and 442.02

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Solution

The fourth proportional to 990.47, 1,484.51 and 442.02 is: 662.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.47 : 1,484.51 = 442.02 : x
  2. Step 2: Convert to fraction form
    990.47/1,484.51 = 442.02/x
  3. Step 3: Cross multiply
    990.47x = 1,484.51 × 442.02
  4. Step 4: Simplify right side
    990.47x = 656,180.90
  5. Step 5: Solve for x
    x = 656,180.90/990.47
  6. Step 6: Final answer
    x = 662.50

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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.