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Finding the Fourth Proportional to 1,478.18, 2,215.82 and 553.50

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Solution

The fourth proportional to 1,478.18, 2,215.82 and 553.50 is: 829.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.18 : 2,215.82 = 553.50 : x
  2. Step 2: Convert to fraction form
    1,478.18/2,215.82 = 553.50/x
  3. Step 3: Cross multiply
    1,478.18x = 2,215.82 × 553.50
  4. Step 4: Simplify right side
    1,478.18x = 1,226,457.75
  5. Step 5: Solve for x
    x = 1,226,457.75/1,478.18
  6. Step 6: Final answer
    x = 829.71

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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.