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Finding the Fourth Proportional to 669,420.48, 923,767 and 378,986.88

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Solution

The fourth proportional to 669,420.48, 923,767 and 378,986.88 is: 522,983.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    669,420.48 : 923,767 = 378,986.88 : x
  2. Step 2: Convert to fraction form
    669,420.48/923,767 = 378,986.88/x
  3. Step 3: Cross multiply
    669,420.48x = 923,767 × 378,986.88
  4. Step 4: Simplify right side
    669,420.48x = 350,095,573,176.96
  5. Step 5: Solve for x
    x = 350,095,573,176.96/669,420.48
  6. Step 6: Final answer
    x = 522,983.06

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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.