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Finding the Fourth Proportional to 1,614.06, 2,421.15 and 688.32

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Solution

The fourth proportional to 1,614.06, 2,421.15 and 688.32 is: 1,032.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,614.06 : 2,421.15 = 688.32 : x
  2. Step 2: Convert to fraction form
    1,614.06/2,421.15 = 688.32/x
  3. Step 3: Cross multiply
    1,614.06x = 2,421.15 × 688.32
  4. Step 4: Simplify right side
    1,614.06x = 1,666,525.97
  5. Step 5: Solve for x
    x = 1,666,525.97/1,614.06
  6. Step 6: Final answer
    x = 1,032.51

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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.