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Finding the Fourth Proportional to 644,816.52, 889,698.66 and 400,021.50

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Solution

The fourth proportional to 644,816.52, 889,698.66 and 400,021.50 is: 551,937.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,816.52 : 889,698.66 = 400,021.50 : x
  2. Step 2: Convert to fraction form
    644,816.52/889,698.66 = 400,021.50/x
  3. Step 3: Cross multiply
    644,816.52x = 889,698.66 × 400,021.50
  4. Step 4: Simplify right side
    644,816.52x = 355,898,592,521.19
  5. Step 5: Solve for x
    x = 355,898,592,521.19/644,816.52
  6. Step 6: Final answer
    x = 551,937.77

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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.