Home / 1,561.80-2,157.12-1,248.15

Finding the Fourth Proportional to 1,561.80, 2,157.12 and 1,248.15

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Solution

The fourth proportional to 1,561.80, 2,157.12 and 1,248.15 is: 1,723.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.80 : 2,157.12 = 1,248.15 : x
  2. Step 2: Convert to fraction form
    1,561.80/2,157.12 = 1,248.15/x
  3. Step 3: Cross multiply
    1,561.80x = 2,157.12 × 1,248.15
  4. Step 4: Simplify right side
    1,561.80x = 2,692,409.33
  5. Step 5: Solve for x
    x = 2,692,409.33/1,561.80
  6. Step 6: Final answer
    x = 1,723.91

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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.