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Finding the Fourth Proportional to 1,469.98, 2,205.54 and 647.67

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Solution

The fourth proportional to 1,469.98, 2,205.54 and 647.67 is: 971.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,469.98 : 2,205.54 = 647.67 : x
  2. Step 2: Convert to fraction form
    1,469.98/2,205.54 = 647.67/x
  3. Step 3: Cross multiply
    1,469.98x = 2,205.54 × 647.67
  4. Step 4: Simplify right side
    1,469.98x = 1,428,462.09
  5. Step 5: Solve for x
    x = 1,428,462.09/1,469.98
  6. Step 6: Final answer
    x = 971.76

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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.