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Finding the Fourth Proportional to 1,440.55, 2,160.74 and 709.88

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Solution

The fourth proportional to 1,440.55, 2,160.74 and 709.88 is: 1,064.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.55 : 2,160.74 = 709.88 : x
  2. Step 2: Convert to fraction form
    1,440.55/2,160.74 = 709.88/x
  3. Step 3: Cross multiply
    1,440.55x = 2,160.74 × 709.88
  4. Step 4: Simplify right side
    1,440.55x = 1,533,857.08
  5. Step 5: Solve for x
    x = 1,533,857.08/1,440.55
  6. Step 6: Final answer
    x = 1,064.78

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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.