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Finding the Fourth Proportional to 1,440.87, 1,988.40 and 811.36

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Solution

The fourth proportional to 1,440.87, 1,988.40 and 811.36 is: 1,119.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.87 : 1,988.40 = 811.36 : x
  2. Step 2: Convert to fraction form
    1,440.87/1,988.40 = 811.36/x
  3. Step 3: Cross multiply
    1,440.87x = 1,988.40 × 811.36
  4. Step 4: Simplify right side
    1,440.87x = 1,613,308.22
  5. Step 5: Solve for x
    x = 1,613,308.22/1,440.87
  6. Step 6: Final answer
    x = 1,119.68

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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.