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Finding the Fourth Proportional to 749.49, 1,124.21 and 338.51

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Solution

The fourth proportional to 749.49, 1,124.21 and 338.51 is: 507.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.49 : 1,124.21 = 338.51 : x
  2. Step 2: Convert to fraction form
    749.49/1,124.21 = 338.51/x
  3. Step 3: Cross multiply
    749.49x = 1,124.21 × 338.51
  4. Step 4: Simplify right side
    749.49x = 380,549.01
  5. Step 5: Solve for x
    x = 380,549.01/749.49
  6. Step 6: Final answer
    x = 507.74

Related Problems

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Half scale
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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.