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Finding the Fourth Proportional to 1,319.32, 1,980.12 and 539.74

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Solution

The fourth proportional to 1,319.32, 1,980.12 and 539.74 is: 810.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.32 : 1,980.12 = 539.74 : x
  2. Step 2: Convert to fraction form
    1,319.32/1,980.12 = 539.74/x
  3. Step 3: Cross multiply
    1,319.32x = 1,980.12 × 539.74
  4. Step 4: Simplify right side
    1,319.32x = 1,068,749.97
  5. Step 5: Solve for x
    x = 1,068,749.97/1,319.32
  6. Step 6: Final answer
    x = 810.08

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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.