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Finding the Fourth Proportional to 1,085.71, 1,628.11 and 427.49

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Solution

The fourth proportional to 1,085.71, 1,628.11 and 427.49 is: 641.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.71 : 1,628.11 = 427.49 : x
  2. Step 2: Convert to fraction form
    1,085.71/1,628.11 = 427.49/x
  3. Step 3: Cross multiply
    1,085.71x = 1,628.11 × 427.49
  4. Step 4: Simplify right side
    1,085.71x = 695,990.47
  5. Step 5: Solve for x
    x = 695,990.47/1,085.71
  6. Step 6: Final answer
    x = 641.05

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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.