Home / 2,158.61-2,979.20-1,319.80

Finding the Fourth Proportional to 2,158.61, 2,979.20 and 1,319.80

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Solution

The fourth proportional to 2,158.61, 2,979.20 and 1,319.80 is: 1,821.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158.61 : 2,979.20 = 1,319.80 : x
  2. Step 2: Convert to fraction form
    2,158.61/2,979.20 = 1,319.80/x
  3. Step 3: Cross multiply
    2,158.61x = 2,979.20 × 1,319.80
  4. Step 4: Simplify right side
    2,158.61x = 3,931,948.16
  5. Step 5: Solve for x
    x = 3,931,948.16/2,158.61
  6. Step 6: Final answer
    x = 1,821.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.