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Finding the Fourth Proportional to 2,160.04, 3,240.18 and 621

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Solution

The fourth proportional to 2,160.04, 3,240.18 and 621 is: 931.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,160.04 : 3,240.18 = 621 : x
  2. Step 2: Convert to fraction form
    2,160.04/3,240.18 = 621/x
  3. Step 3: Cross multiply
    2,160.04x = 3,240.18 × 621
  4. Step 4: Simplify right side
    2,160.04x = 2,012,151.78
  5. Step 5: Solve for x
    x = 2,012,151.78/2,160.04
  6. Step 6: Final answer
    x = 931.53

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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.