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Finding the Fourth Proportional to 1,390.86, 2,086.70 and 417.11

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Solution

The fourth proportional to 1,390.86, 2,086.70 and 417.11 is: 625.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.86 : 2,086.70 = 417.11 : x
  2. Step 2: Convert to fraction form
    1,390.86/2,086.70 = 417.11/x
  3. Step 3: Cross multiply
    1,390.86x = 2,086.70 × 417.11
  4. Step 4: Simplify right side
    1,390.86x = 870,370.92
  5. Step 5: Solve for x
    x = 870,370.92/1,390.86
  6. Step 6: Final answer
    x = 625.78

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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.