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Finding the Fourth Proportional to 1,393.46, 2,090.20 and 571.16

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Solution

The fourth proportional to 1,393.46, 2,090.20 and 571.16 is: 856.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.46 : 2,090.20 = 571.16 : x
  2. Step 2: Convert to fraction form
    1,393.46/2,090.20 = 571.16/x
  3. Step 3: Cross multiply
    1,393.46x = 2,090.20 × 571.16
  4. Step 4: Simplify right side
    1,393.46x = 1,193,838.63
  5. Step 5: Solve for x
    x = 1,193,838.63/1,393.46
  6. Step 6: Final answer
    x = 856.74

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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.