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Finding the Fourth Proportional to 402,479.43, 555,394.71 and 221,187.45

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Solution

The fourth proportional to 402,479.43, 555,394.71 and 221,187.45 is: 305,223.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,479.43 : 555,394.71 = 221,187.45 : x
  2. Step 2: Convert to fraction form
    402,479.43/555,394.71 = 221,187.45/x
  3. Step 3: Cross multiply
    402,479.43x = 555,394.71 × 221,187.45
  4. Step 4: Simplify right side
    402,479.43x = 122,846,339,648.39
  5. Step 5: Solve for x
    x = 122,846,339,648.39/402,479.43
  6. Step 6: Final answer
    x = 305,223.90

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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.