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Finding the Fourth Proportional to 1,397.71, 1,928.50 and 808.21

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Solution

The fourth proportional to 1,397.71, 1,928.50 and 808.21 is: 1,115.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.71 : 1,928.50 = 808.21 : x
  2. Step 2: Convert to fraction form
    1,397.71/1,928.50 = 808.21/x
  3. Step 3: Cross multiply
    1,397.71x = 1,928.50 × 808.21
  4. Step 4: Simplify right side
    1,397.71x = 1,558,632.99
  5. Step 5: Solve for x
    x = 1,558,632.99/1,397.71
  6. Step 6: Final answer
    x = 1,115.13

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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.