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Finding the Fourth Proportional to 1,393.72, 2,090.58 and 817

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Solution

The fourth proportional to 1,393.72, 2,090.58 and 817 is: 1,225.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.72 : 2,090.58 = 817 : x
  2. Step 2: Convert to fraction form
    1,393.72/2,090.58 = 817/x
  3. Step 3: Cross multiply
    1,393.72x = 2,090.58 × 817
  4. Step 4: Simplify right side
    1,393.72x = 1,708,003.86
  5. Step 5: Solve for x
    x = 1,708,003.86/1,393.72
  6. Step 6: Final answer
    x = 1,225.50

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.