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Finding the Fourth Proportional to 1,439.88, 1,990.47 and 1,292.25

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Solution

The fourth proportional to 1,439.88, 1,990.47 and 1,292.25 is: 1,786.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.88 : 1,990.47 = 1,292.25 : x
  2. Step 2: Convert to fraction form
    1,439.88/1,990.47 = 1,292.25/x
  3. Step 3: Cross multiply
    1,439.88x = 1,990.47 × 1,292.25
  4. Step 4: Simplify right side
    1,439.88x = 2,572,197.17
  5. Step 5: Solve for x
    x = 2,572,197.17/1,439.88
  6. Step 6: Final answer
    x = 1,786.40

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Double scale
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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.