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Finding the Fourth Proportional to 402,612.38, 555,604.89 and 221,336

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Solution

The fourth proportional to 402,612.38, 555,604.89 and 221,336 is: 305,443.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,612.38 : 555,604.89 = 221,336 : x
  2. Step 2: Convert to fraction form
    402,612.38/555,604.89 = 221,336/x
  3. Step 3: Cross multiply
    402,612.38x = 555,604.89 × 221,336
  4. Step 4: Simplify right side
    402,612.38x = 122,975,363,933.04
  5. Step 5: Solve for x
    x = 122,975,363,933.04/402,612.38
  6. Step 6: Final answer
    x = 305,443.57

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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.