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Finding the Fourth Proportional to 1,027.40, 1,539.90 and 442.40

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Solution

The fourth proportional to 1,027.40, 1,539.90 and 442.40 is: 663.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,027.40 : 1,539.90 = 442.40 : x
  2. Step 2: Convert to fraction form
    1,027.40/1,539.90 = 442.40/x
  3. Step 3: Cross multiply
    1,027.40x = 1,539.90 × 442.40
  4. Step 4: Simplify right side
    1,027.40x = 681,251.76
  5. Step 5: Solve for x
    x = 681,251.76/1,027.40
  6. Step 6: Final answer
    x = 663.08

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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.