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Finding the Fourth Proportional to 402,678.91, 555,697.15 and 221,393.94

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Solution

The fourth proportional to 402,678.91, 555,697.15 and 221,393.94 is: 305,523.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,678.91 : 555,697.15 = 221,393.94 : x
  2. Step 2: Convert to fraction form
    402,678.91/555,697.15 = 221,393.94/x
  3. Step 3: Cross multiply
    402,678.91x = 555,697.15 × 221,393.94
  4. Step 4: Simplify right side
    402,678.91x = 123,027,978,706.79
  5. Step 5: Solve for x
    x = 123,027,978,706.79/402,678.91
  6. Step 6: Final answer
    x = 305,523.77

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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.