Home / 1,319.95-1,979.80-539.98

Finding the Fourth Proportional to 1,319.95, 1,979.80 and 539.98

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Solution

The fourth proportional to 1,319.95, 1,979.80 and 539.98 is: 809.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.95 : 1,979.80 = 539.98 : x
  2. Step 2: Convert to fraction form
    1,319.95/1,979.80 = 539.98/x
  3. Step 3: Cross multiply
    1,319.95x = 1,979.80 × 539.98
  4. Step 4: Simplify right side
    1,319.95x = 1,069,046.10
  5. Step 5: Solve for x
    x = 1,069,046.10/1,319.95
  6. Step 6: Final answer
    x = 809.92

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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.