Home / 1,542.02-2,128.41-990.98

Finding the Fourth Proportional to 1,542.02, 2,128.41 and 990.98

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Solution

The fourth proportional to 1,542.02, 2,128.41 and 990.98 is: 1,367.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,542.02 : 2,128.41 = 990.98 : x
  2. Step 2: Convert to fraction form
    1,542.02/2,128.41 = 990.98/x
  3. Step 3: Cross multiply
    1,542.02x = 2,128.41 × 990.98
  4. Step 4: Simplify right side
    1,542.02x = 2,109,211.74
  5. Step 5: Solve for x
    x = 2,109,211.74/1,542.02
  6. Step 6: Final answer
    x = 1,367.82

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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.