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Finding the Fourth Proportional to 1,081.36, 1,492.30 and 639.10

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Solution

The fourth proportional to 1,081.36, 1,492.30 and 639.10 is: 881.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.36 : 1,492.30 = 639.10 : x
  2. Step 2: Convert to fraction form
    1,081.36/1,492.30 = 639.10/x
  3. Step 3: Cross multiply
    1,081.36x = 1,492.30 × 639.10
  4. Step 4: Simplify right side
    1,081.36x = 953,728.93
  5. Step 5: Solve for x
    x = 953,728.93/1,081.36
  6. Step 6: Final answer
    x = 881.97

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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.