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Finding the Fourth Proportional to 1,489.98, 2,056.20 and 817.81

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Solution

The fourth proportional to 1,489.98, 2,056.20 and 817.81 is: 1,128.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.98 : 2,056.20 = 817.81 : x
  2. Step 2: Convert to fraction form
    1,489.98/2,056.20 = 817.81/x
  3. Step 3: Cross multiply
    1,489.98x = 2,056.20 × 817.81
  4. Step 4: Simplify right side
    1,489.98x = 1,681,580.92
  5. Step 5: Solve for x
    x = 1,681,580.92/1,489.98
  6. Step 6: Final answer
    x = 1,128.59

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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.