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Finding the Fourth Proportional to 644,757.84, 889,847.64 and 390,111.12

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Solution

The fourth proportional to 644,757.84, 889,847.64 and 390,111.12 is: 538,402.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,757.84 : 889,847.64 = 390,111.12 : x
  2. Step 2: Convert to fraction form
    644,757.84/889,847.64 = 390,111.12/x
  3. Step 3: Cross multiply
    644,757.84x = 889,847.64 × 390,111.12
  4. Step 4: Simplify right side
    644,757.84x = 347,139,459,469.76
  5. Step 5: Solve for x
    x = 347,139,459,469.76/644,757.84
  6. Step 6: Final answer
    x = 538,402.85

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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.