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Finding the Fourth Proportional to 678,878.88, 936,748.80 and 392,343.72

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Solution

The fourth proportional to 678,878.88, 936,748.80 and 392,343.72 is: 541,374.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,878.88 : 936,748.80 = 392,343.72 : x
  2. Step 2: Convert to fraction form
    678,878.88/936,748.80 = 392,343.72/x
  3. Step 3: Cross multiply
    678,878.88x = 936,748.80 × 392,343.72
  4. Step 4: Simplify right side
    678,878.88x = 367,527,508,897.54
  5. Step 5: Solve for x
    x = 367,527,508,897.54/678,878.88
  6. Step 6: Final answer
    x = 541,374.20

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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.