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Finding the Fourth Proportional to 644,294.70, 889,571.46 and 402,685.86

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Solution

The fourth proportional to 644,294.70, 889,571.46 and 402,685.86 is: 555,984.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,294.70 : 889,571.46 = 402,685.86 : x
  2. Step 2: Convert to fraction form
    644,294.70/889,571.46 = 402,685.86/x
  3. Step 3: Cross multiply
    644,294.70x = 889,571.46 × 402,685.86
  4. Step 4: Simplify right side
    644,294.70x = 358,217,848,401.56
  5. Step 5: Solve for x
    x = 358,217,848,401.56/644,294.70
  6. Step 6: Final answer
    x = 555,984.47

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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.