Home / 1,557.85-2,149.91-998.81

Finding the Fourth Proportional to 1,557.85, 2,149.91 and 998.81

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Solution

The fourth proportional to 1,557.85, 2,149.91 and 998.81 is: 1,378.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.85 : 2,149.91 = 998.81 : x
  2. Step 2: Convert to fraction form
    1,557.85/2,149.91 = 998.81/x
  3. Step 3: Cross multiply
    1,557.85x = 2,149.91 × 998.81
  4. Step 4: Simplify right side
    1,557.85x = 2,147,346.61
  5. Step 5: Solve for x
    x = 2,147,346.61/1,557.85
  6. Step 6: Final answer
    x = 1,378.40

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1.5x scale

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.