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Finding the Fourth Proportional to 1,393.47, 2,090.21 and 662.85

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Solution

The fourth proportional to 1,393.47, 2,090.21 and 662.85 is: 994.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.47 : 2,090.21 = 662.85 : x
  2. Step 2: Convert to fraction form
    1,393.47/2,090.21 = 662.85/x
  3. Step 3: Cross multiply
    1,393.47x = 2,090.21 × 662.85
  4. Step 4: Simplify right side
    1,393.47x = 1,385,492.38
  5. Step 5: Solve for x
    x = 1,385,492.38/1,393.47
  6. Step 6: Final answer
    x = 994.28

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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.