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Finding the Fourth Proportional to 1,351.86, 1,865.70 and 910.68

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Solution

The fourth proportional to 1,351.86, 1,865.70 and 910.68 is: 1,256.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.86 : 1,865.70 = 910.68 : x
  2. Step 2: Convert to fraction form
    1,351.86/1,865.70 = 910.68/x
  3. Step 3: Cross multiply
    1,351.86x = 1,865.70 × 910.68
  4. Step 4: Simplify right side
    1,351.86x = 1,699,055.68
  5. Step 5: Solve for x
    x = 1,699,055.68/1,351.86
  6. Step 6: Final answer
    x = 1,256.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.