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Finding the Fourth Proportional to 743.57, 1,115.51 and 256.49

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Solution

The fourth proportional to 743.57, 1,115.51 and 256.49 is: 384.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.57 : 1,115.51 = 256.49 : x
  2. Step 2: Convert to fraction form
    743.57/1,115.51 = 256.49/x
  3. Step 3: Cross multiply
    743.57x = 1,115.51 × 256.49
  4. Step 4: Simplify right side
    743.57x = 286,117.16
  5. Step 5: Solve for x
    x = 286,117.16/743.57
  6. Step 6: Final answer
    x = 384.79

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Double scale
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Similar ratio
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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.