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Finding the Fourth Proportional to 402,489.72, 555,449.13 and 221,208.12

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Solution

The fourth proportional to 402,489.72, 555,449.13 and 221,208.12 is: 305,274.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,489.72 : 555,449.13 = 221,208.12 : x
  2. Step 2: Convert to fraction form
    402,489.72/555,449.13 = 221,208.12/x
  3. Step 3: Cross multiply
    402,489.72x = 555,449.13 × 221,208.12
  4. Step 4: Simplify right side
    402,489.72x = 122,869,857,802.94
  5. Step 5: Solve for x
    x = 122,869,857,802.94/402,489.72
  6. Step 6: Final answer
    x = 305,274.52

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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.