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Finding the Fourth Proportional to 1,078.11, 1,617.37 and 347.63

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Solution

The fourth proportional to 1,078.11, 1,617.37 and 347.63 is: 521.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.11 : 1,617.37 = 347.63 : x
  2. Step 2: Convert to fraction form
    1,078.11/1,617.37 = 347.63/x
  3. Step 3: Cross multiply
    1,078.11x = 1,617.37 × 347.63
  4. Step 4: Simplify right side
    1,078.11x = 562,237.38
  5. Step 5: Solve for x
    x = 562,237.38/1,078.11
  6. Step 6: Final answer
    x = 521.50

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Half scale
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Double scale
Find fourth proportional to 1,079.11, 1,618.87 and 348.63
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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.