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Finding the Fourth Proportional to 1,390.92, 2,086.76 and 417.05

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Solution

The fourth proportional to 1,390.92, 2,086.76 and 417.05 is: 625.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.92 : 2,086.76 = 417.05 : x
  2. Step 2: Convert to fraction form
    1,390.92/2,086.76 = 417.05/x
  3. Step 3: Cross multiply
    1,390.92x = 2,086.76 × 417.05
  4. Step 4: Simplify right side
    1,390.92x = 870,281.69
  5. Step 5: Solve for x
    x = 870,281.69/1,390.92
  6. Step 6: Final answer
    x = 625.69

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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.