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Finding the Fourth Proportional to 1,397.64, 1,928.96 and 808.36

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Solution

The fourth proportional to 1,397.64, 1,928.96 and 808.36 is: 1,115.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.64 : 1,928.96 = 808.36 : x
  2. Step 2: Convert to fraction form
    1,397.64/1,928.96 = 808.36/x
  3. Step 3: Cross multiply
    1,397.64x = 1,928.96 × 808.36
  4. Step 4: Simplify right side
    1,397.64x = 1,559,294.11
  5. Step 5: Solve for x
    x = 1,559,294.11/1,397.64
  6. Step 6: Final answer
    x = 1,115.66

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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.