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Finding the Fourth Proportional to 667,648.28, 921,209.10 and 395,580.20

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Solution

The fourth proportional to 667,648.28, 921,209.10 and 395,580.20 is: 545,814.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,648.28 : 921,209.10 = 395,580.20 : x
  2. Step 2: Convert to fraction form
    667,648.28/921,209.10 = 395,580.20/x
  3. Step 3: Cross multiply
    667,648.28x = 921,209.10 × 395,580.20
  4. Step 4: Simplify right side
    667,648.28x = 364,412,080,019.82
  5. Step 5: Solve for x
    x = 364,412,080,019.82/667,648.28
  6. Step 6: Final answer
    x = 545,814.45

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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.