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Finding the Fourth Proportional to 1,089.95, 1,635.20 and 397.00

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Solution

The fourth proportional to 1,089.95, 1,635.20 and 397.00 is: 595.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.95 : 1,635.20 = 397.00 : x
  2. Step 2: Convert to fraction form
    1,089.95/1,635.20 = 397.00/x
  3. Step 3: Cross multiply
    1,089.95x = 1,635.20 × 397.00
  4. Step 4: Simplify right side
    1,089.95x = 649,164.24
  5. Step 5: Solve for x
    x = 649,164.24/1,089.95
  6. Step 6: Final answer
    x = 595.59

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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.