Home / 1,207.20-1,811.40-476.80

Finding the Fourth Proportional to 1,207.20, 1,811.40 and 476.80

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Solution

The fourth proportional to 1,207.20, 1,811.40 and 476.80 is: 715.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.20 : 1,811.40 = 476.80 : x
  2. Step 2: Convert to fraction form
    1,207.20/1,811.40 = 476.80/x
  3. Step 3: Cross multiply
    1,207.20x = 1,811.40 × 476.80
  4. Step 4: Simplify right side
    1,207.20x = 863,675.52
  5. Step 5: Solve for x
    x = 863,675.52/1,207.20
  6. Step 6: Final answer
    x = 715.44

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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.