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Finding the Fourth Proportional to 681,013.76, 939,864.32 and 379,207.68

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Solution

The fourth proportional to 681,013.76, 939,864.32 and 379,207.68 is: 523,342.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,013.76 : 939,864.32 = 379,207.68 : x
  2. Step 2: Convert to fraction form
    681,013.76/939,864.32 = 379,207.68/x
  3. Step 3: Cross multiply
    681,013.76x = 939,864.32 × 379,207.68
  4. Step 4: Simplify right side
    681,013.76x = 356,403,768,301.98
  5. Step 5: Solve for x
    x = 356,403,768,301.98/681,013.76
  6. Step 6: Final answer
    x = 523,342.98

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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.