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Finding the Fourth Proportional to 1,614.74, 2,420.54 and 690.54

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Solution

The fourth proportional to 1,614.74, 2,420.54 and 690.54 is: 1,035.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,614.74 : 2,420.54 = 690.54 : x
  2. Step 2: Convert to fraction form
    1,614.74/2,420.54 = 690.54/x
  3. Step 3: Cross multiply
    1,614.74x = 2,420.54 × 690.54
  4. Step 4: Simplify right side
    1,614.74x = 1,671,479.69
  5. Step 5: Solve for x
    x = 1,671,479.69/1,614.74
  6. Step 6: Final answer
    x = 1,035.14

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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.