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Finding the Fourth Proportional to 806.60, 1,210.80 and 753.72

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Solution

The fourth proportional to 806.60, 1,210.80 and 753.72 is: 1,131.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.60 : 1,210.80 = 753.72 : x
  2. Step 2: Convert to fraction form
    806.60/1,210.80 = 753.72/x
  3. Step 3: Cross multiply
    806.60x = 1,210.80 × 753.72
  4. Step 4: Simplify right side
    806.60x = 912,604.18
  5. Step 5: Solve for x
    x = 912,604.18/806.60
  6. Step 6: Final answer
    x = 1,131.42

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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.