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Finding the Fourth Proportional to 647,939.84, 972,061.22 and 221,478.95

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Solution

The fourth proportional to 647,939.84, 972,061.22 and 221,478.95 is: 332,270.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,939.84 : 972,061.22 = 221,478.95 : x
  2. Step 2: Convert to fraction form
    647,939.84/972,061.22 = 221,478.95/x
  3. Step 3: Cross multiply
    647,939.84x = 972,061.22 × 221,478.95
  4. Step 4: Simplify right side
    647,939.84x = 215,291,101,325.17
  5. Step 5: Solve for x
    x = 215,291,101,325.17/647,939.84
  6. Step 6: Final answer
    x = 332,270.20

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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.