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Finding the Fourth Proportional to 1,398.87, 1,930.50 and 801.36

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Solution

The fourth proportional to 1,398.87, 1,930.50 and 801.36 is: 1,105.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.87 : 1,930.50 = 801.36 : x
  2. Step 2: Convert to fraction form
    1,398.87/1,930.50 = 801.36/x
  3. Step 3: Cross multiply
    1,398.87x = 1,930.50 × 801.36
  4. Step 4: Simplify right side
    1,398.87x = 1,547,025.48
  5. Step 5: Solve for x
    x = 1,547,025.48/1,398.87
  6. Step 6: Final answer
    x = 1,105.91

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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.