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Finding the Fourth Proportional to 1,775.72, 2,450.40 and 989.69

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Solution

The fourth proportional to 1,775.72, 2,450.40 and 989.69 is: 1,365.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,775.72 : 2,450.40 = 989.69 : x
  2. Step 2: Convert to fraction form
    1,775.72/2,450.40 = 989.69/x
  3. Step 3: Cross multiply
    1,775.72x = 2,450.40 × 989.69
  4. Step 4: Simplify right side
    1,775.72x = 2,425,136.38
  5. Step 5: Solve for x
    x = 2,425,136.38/1,775.72
  6. Step 6: Final answer
    x = 1,365.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.