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Finding the Fourth Proportional to 398,860.32, 550,428 and 217,572.48

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Solution

The fourth proportional to 398,860.32, 550,428 and 217,572.48 is: 300,250.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,860.32 : 550,428 = 217,572.48 : x
  2. Step 2: Convert to fraction form
    398,860.32/550,428 = 217,572.48/x
  3. Step 3: Cross multiply
    398,860.32x = 550,428 × 217,572.48
  4. Step 4: Simplify right side
    398,860.32x = 119,757,985,021.44
  5. Step 5: Solve for x
    x = 119,757,985,021.44/398,860.32
  6. Step 6: Final answer
    x = 300,250.44

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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.