Home / 1,557.20-2,149.02-858.57

Finding the Fourth Proportional to 1,557.20, 2,149.02 and 858.57

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Solution

The fourth proportional to 1,557.20, 2,149.02 and 858.57 is: 1,184.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,557.20 : 2,149.02 = 858.57 : x
  2. Step 2: Convert to fraction form
    1,557.20/2,149.02 = 858.57/x
  3. Step 3: Cross multiply
    1,557.20x = 2,149.02 × 858.57
  4. Step 4: Simplify right side
    1,557.20x = 1,845,084.10
  5. Step 5: Solve for x
    x = 1,845,084.10/1,557.20
  6. Step 6: Final answer
    x = 1,184.88

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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.