Home / 1,126.23-1,686.95-639.03

Finding the Fourth Proportional to 1,126.23, 1,686.95 and 639.03

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Solution

The fourth proportional to 1,126.23, 1,686.95 and 639.03 is: 957.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.23 : 1,686.95 = 639.03 : x
  2. Step 2: Convert to fraction form
    1,126.23/1,686.95 = 639.03/x
  3. Step 3: Cross multiply
    1,126.23x = 1,686.95 × 639.03
  4. Step 4: Simplify right side
    1,126.23x = 1,078,008.46
  5. Step 5: Solve for x
    x = 1,078,008.46/1,126.23
  6. Step 6: Final answer
    x = 957.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.