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Finding the Fourth Proportional to 390,510.66, 538,889.99 and 220,748.43

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Solution

The fourth proportional to 390,510.66, 538,889.99 and 220,748.43 is: 304,624.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,510.66 : 538,889.99 = 220,748.43 : x
  2. Step 2: Convert to fraction form
    390,510.66/538,889.99 = 220,748.43/x
  3. Step 3: Cross multiply
    390,510.66x = 538,889.99 × 220,748.43
  4. Step 4: Simplify right side
    390,510.66x = 118,959,118,131.47
  5. Step 5: Solve for x
    x = 118,959,118,131.47/390,510.66
  6. Step 6: Final answer
    x = 304,624.51

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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.