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Finding the Fourth Proportional to 644,906.72, 889,964.86 and 358,420.66

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Solution

The fourth proportional to 644,906.72, 889,964.86 and 358,420.66 is: 494,616.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,906.72 : 889,964.86 = 358,420.66 : x
  2. Step 2: Convert to fraction form
    644,906.72/889,964.86 = 358,420.66/x
  3. Step 3: Cross multiply
    644,906.72x = 889,964.86 × 358,420.66
  4. Step 4: Simplify right side
    644,906.72x = 318,981,792,498.01
  5. Step 5: Solve for x
    x = 318,981,792,498.01/644,906.72
  6. Step 6: Final answer
    x = 494,616.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.