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Finding the Fourth Proportional to 413,139.40, 619,709.10 and 271,421.80

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Solution

The fourth proportional to 413,139.40, 619,709.10 and 271,421.80 is: 407,132.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    413,139.40 : 619,709.10 = 271,421.80 : x
  2. Step 2: Convert to fraction form
    413,139.40/619,709.10 = 271,421.80/x
  3. Step 3: Cross multiply
    413,139.40x = 619,709.10 × 271,421.80
  4. Step 4: Simplify right side
    413,139.40x = 168,202,559,398.38
  5. Step 5: Solve for x
    x = 168,202,559,398.38/413,139.40
  6. Step 6: Final answer
    x = 407,132.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.