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Finding the Fourth Proportional to 1,390.87, 2,086.54 and 568.92

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Solution

The fourth proportional to 1,390.87, 2,086.54 and 568.92 is: 853.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.87 : 2,086.54 = 568.92 : x
  2. Step 2: Convert to fraction form
    1,390.87/2,086.54 = 568.92/x
  3. Step 3: Cross multiply
    1,390.87x = 2,086.54 × 568.92
  4. Step 4: Simplify right side
    1,390.87x = 1,187,080.74
  5. Step 5: Solve for x
    x = 1,187,080.74/1,390.87
  6. Step 6: Final answer
    x = 853.48

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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.