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Finding the Fourth Proportional to 1,390.72, 2,086.29 and 416.90

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Solution

The fourth proportional to 1,390.72, 2,086.29 and 416.90 is: 625.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.72 : 2,086.29 = 416.90 : x
  2. Step 2: Convert to fraction form
    1,390.72/2,086.29 = 416.90/x
  3. Step 3: Cross multiply
    1,390.72x = 2,086.29 × 416.90
  4. Step 4: Simplify right side
    1,390.72x = 869,776.13
  5. Step 5: Solve for x
    x = 869,776.13/1,390.72
  6. Step 6: Final answer
    x = 625.41

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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.