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Finding the Fourth Proportional to 1,397.48, 1,928.48 and 808

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Solution

The fourth proportional to 1,397.48, 1,928.48 and 808 is: 1,115.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.48 : 1,928.48 = 808 : x
  2. Step 2: Convert to fraction form
    1,397.48/1,928.48 = 808/x
  3. Step 3: Cross multiply
    1,397.48x = 1,928.48 × 808
  4. Step 4: Simplify right side
    1,397.48x = 1,558,211.84
  5. Step 5: Solve for x
    x = 1,558,211.84/1,397.48
  6. Step 6: Final answer
    x = 1,115.02

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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.