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Finding the Fourth Proportional to 1,393.47, 2,090.21 and 613.29

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Solution

The fourth proportional to 1,393.47, 2,090.21 and 613.29 is: 919.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.47 : 2,090.21 = 613.29 : x
  2. Step 2: Convert to fraction form
    1,393.47/2,090.21 = 613.29/x
  3. Step 3: Cross multiply
    1,393.47x = 2,090.21 × 613.29
  4. Step 4: Simplify right side
    1,393.47x = 1,281,904.89
  5. Step 5: Solve for x
    x = 1,281,904.89/1,393.47
  6. Step 6: Final answer
    x = 919.94

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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.