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Finding the Fourth Proportional to 642,102.78, 886,108.34 and 387,404.76

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Solution

The fourth proportional to 642,102.78, 886,108.34 and 387,404.76 is: 534,622.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,102.78 : 886,108.34 = 387,404.76 : x
  2. Step 2: Convert to fraction form
    642,102.78/886,108.34 = 387,404.76/x
  3. Step 3: Cross multiply
    642,102.78x = 886,108.34 × 387,404.76
  4. Step 4: Simplify right side
    642,102.78x = 343,282,588,791.70
  5. Step 5: Solve for x
    x = 343,282,588,791.70/642,102.78
  6. Step 6: Final answer
    x = 534,622.49

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1.5x scale

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.