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Finding the Fourth Proportional to 1,393.70, 2,090.51 and 571.35

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Solution

The fourth proportional to 1,393.70, 2,090.51 and 571.35 is: 857.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.70 : 2,090.51 = 571.35 : x
  2. Step 2: Convert to fraction form
    1,393.70/2,090.51 = 571.35/x
  3. Step 3: Cross multiply
    1,393.70x = 2,090.51 × 571.35
  4. Step 4: Simplify right side
    1,393.70x = 1,194,412.89
  5. Step 5: Solve for x
    x = 1,194,412.89/1,393.70
  6. Step 6: Final answer
    x = 857.01

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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.