Home / 1,142.24-1,576.20-644.80

Finding the Fourth Proportional to 1,142.24, 1,576.20 and 644.80

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Solution

The fourth proportional to 1,142.24, 1,576.20 and 644.80 is: 889.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.24 : 1,576.20 = 644.80 : x
  2. Step 2: Convert to fraction form
    1,142.24/1,576.20 = 644.80/x
  3. Step 3: Cross multiply
    1,142.24x = 1,576.20 × 644.80
  4. Step 4: Simplify right side
    1,142.24x = 1,016,333.76
  5. Step 5: Solve for x
    x = 1,016,333.76/1,142.24
  6. Step 6: Final answer
    x = 889.77

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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.