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Finding the Fourth Proportional to 1,478.84, 2,216.16 and 821.00

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Solution

The fourth proportional to 1,478.84, 2,216.16 and 821.00 is: 1,230.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.84 : 2,216.16 = 821.00 : x
  2. Step 2: Convert to fraction form
    1,478.84/2,216.16 = 821.00/x
  3. Step 3: Cross multiply
    1,478.84x = 2,216.16 × 821.00
  4. Step 4: Simplify right side
    1,478.84x = 1,819,472.90
  5. Step 5: Solve for x
    x = 1,819,472.90/1,478.84
  6. Step 6: Final answer
    x = 1,230.34

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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.