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Finding the Fourth Proportional to 1,421.76, 2,131.02 and 690.24

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Solution

The fourth proportional to 1,421.76, 2,131.02 and 690.24 is: 1,034.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.76 : 2,131.02 = 690.24 : x
  2. Step 2: Convert to fraction form
    1,421.76/2,131.02 = 690.24/x
  3. Step 3: Cross multiply
    1,421.76x = 2,131.02 × 690.24
  4. Step 4: Simplify right side
    1,421.76x = 1,470,915.24
  5. Step 5: Solve for x
    x = 1,470,915.24/1,421.76
  6. Step 6: Final answer
    x = 1,034.57

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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.