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Finding the Fourth Proportional to 743.51, 1,116.28 and 378.55

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Solution

The fourth proportional to 743.51, 1,116.28 and 378.55 is: 568.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.51 : 1,116.28 = 378.55 : x
  2. Step 2: Convert to fraction form
    743.51/1,116.28 = 378.55/x
  3. Step 3: Cross multiply
    743.51x = 1,116.28 × 378.55
  4. Step 4: Simplify right side
    743.51x = 422,562.21
  5. Step 5: Solve for x
    x = 422,562.21/743.51
  6. Step 6: Final answer
    x = 568.34

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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.