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Finding the Fourth Proportional to 1,419.65, 2,129.67 and 688.62

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Solution

The fourth proportional to 1,419.65, 2,129.67 and 688.62 is: 1,033.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.65 : 2,129.67 = 688.62 : x
  2. Step 2: Convert to fraction form
    1,419.65/2,129.67 = 688.62/x
  3. Step 3: Cross multiply
    1,419.65x = 2,129.67 × 688.62
  4. Step 4: Simplify right side
    1,419.65x = 1,466,533.36
  5. Step 5: Solve for x
    x = 1,466,533.36/1,419.65
  6. Step 6: Final answer
    x = 1,033.02

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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.