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Finding the Fourth Proportional to 421,388.50, 581,526.66 and 255,818.47

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Solution

The fourth proportional to 421,388.50, 581,526.66 and 255,818.47 is: 353,035.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,388.50 : 581,526.66 = 255,818.47 : x
  2. Step 2: Convert to fraction form
    421,388.50/581,526.66 = 255,818.47/x
  3. Step 3: Cross multiply
    421,388.50x = 581,526.66 × 255,818.47
  4. Step 4: Simplify right side
    421,388.50x = 148,765,260,425.41
  5. Step 5: Solve for x
    x = 148,765,260,425.41/421,388.50
  6. Step 6: Final answer
    x = 353,035.88

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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.