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Finding the Fourth Proportional to 1,681.72, 2,524.20 and 989.20

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Solution

The fourth proportional to 1,681.72, 2,524.20 and 989.20 is: 1,484.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,681.72 : 2,524.20 = 989.20 : x
  2. Step 2: Convert to fraction form
    1,681.72/2,524.20 = 989.20/x
  3. Step 3: Cross multiply
    1,681.72x = 2,524.20 × 989.20
  4. Step 4: Simplify right side
    1,681.72x = 2,496,938.64
  5. Step 5: Solve for x
    x = 2,496,938.64/1,681.72
  6. Step 6: Final answer
    x = 1,484.75

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1.5x scale

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.