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Finding the Fourth Proportional to 1,173.40, 1,762.80 and 808.90

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Solution

The fourth proportional to 1,173.40, 1,762.80 and 808.90 is: 1,215.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.40 : 1,762.80 = 808.90 : x
  2. Step 2: Convert to fraction form
    1,173.40/1,762.80 = 808.90/x
  3. Step 3: Cross multiply
    1,173.40x = 1,762.80 × 808.90
  4. Step 4: Simplify right side
    1,173.40x = 1,425,928.92
  5. Step 5: Solve for x
    x = 1,425,928.92/1,173.40
  6. Step 6: Final answer
    x = 1,215.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.