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Finding the Fourth Proportional to 1,421.50, 2,131.84 and 719.02

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Solution

The fourth proportional to 1,421.50, 2,131.84 and 719.02 is: 1,078.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.50 : 2,131.84 = 719.02 : x
  2. Step 2: Convert to fraction form
    1,421.50/2,131.84 = 719.02/x
  3. Step 3: Cross multiply
    1,421.50x = 2,131.84 × 719.02
  4. Step 4: Simplify right side
    1,421.50x = 1,532,835.60
  5. Step 5: Solve for x
    x = 1,532,835.60/1,421.50
  6. Step 6: Final answer
    x = 1,078.32

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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.