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Finding the Fourth Proportional to 1,316.42, 1,816.44 and 749.16

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Solution

The fourth proportional to 1,316.42, 1,816.44 and 749.16 is: 1,033.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.42 : 1,816.44 = 749.16 : x
  2. Step 2: Convert to fraction form
    1,316.42/1,816.44 = 749.16/x
  3. Step 3: Cross multiply
    1,316.42x = 1,816.44 × 749.16
  4. Step 4: Simplify right side
    1,316.42x = 1,360,801.38
  5. Step 5: Solve for x
    x = 1,360,801.38/1,316.42
  6. Step 6: Final answer
    x = 1,033.71

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.