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Finding the Fourth Proportional to 418,986.90, 578,491.20 and 392,218.02

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Solution

The fourth proportional to 418,986.90, 578,491.20 and 392,218.02 is: 541,531.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,986.90 : 578,491.20 = 392,218.02 : x
  2. Step 2: Convert to fraction form
    418,986.90/578,491.20 = 392,218.02/x
  3. Step 3: Cross multiply
    418,986.90x = 578,491.20 × 392,218.02
  4. Step 4: Simplify right side
    418,986.90x = 226,894,673,051.42
  5. Step 5: Solve for x
    x = 226,894,673,051.42/418,986.90
  6. Step 6: Final answer
    x = 541,531.66

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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.