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Finding the Fourth Proportional to 1,081.78, 1,623.07 and 432.56

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Solution

The fourth proportional to 1,081.78, 1,623.07 and 432.56 is: 649.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.78 : 1,623.07 = 432.56 : x
  2. Step 2: Convert to fraction form
    1,081.78/1,623.07 = 432.56/x
  3. Step 3: Cross multiply
    1,081.78x = 1,623.07 × 432.56
  4. Step 4: Simplify right side
    1,081.78x = 702,079.76
  5. Step 5: Solve for x
    x = 702,079.76/1,081.78
  6. Step 6: Final answer
    x = 649.01

Related Problems

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Double scale
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1.5x scale

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.