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Finding the Fourth Proportional to 806.91, 1,210.70 and 547.20

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Solution

The fourth proportional to 806.91, 1,210.70 and 547.20 is: 821.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.91 : 1,210.70 = 547.20 : x
  2. Step 2: Convert to fraction form
    806.91/1,210.70 = 547.20/x
  3. Step 3: Cross multiply
    806.91x = 1,210.70 × 547.20
  4. Step 4: Simplify right side
    806.91x = 662,495.04
  5. Step 5: Solve for x
    x = 662,495.04/806.91
  6. Step 6: Final answer
    x = 821.03

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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.