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Finding the Fourth Proportional to 990.95, 1,488.72 and 621.91

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Solution

The fourth proportional to 990.95, 1,488.72 and 621.91 is: 934.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.95 : 1,488.72 = 621.91 : x
  2. Step 2: Convert to fraction form
    990.95/1,488.72 = 621.91/x
  3. Step 3: Cross multiply
    990.95x = 1,488.72 × 621.91
  4. Step 4: Simplify right side
    990.95x = 925,842.41
  5. Step 5: Solve for x
    x = 925,842.41/990.95
  6. Step 6: Final answer
    x = 934.30

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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.