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Finding the Fourth Proportional to 328,717.68, 492,818.40 and 139,022.88

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Solution

The fourth proportional to 328,717.68, 492,818.40 and 139,022.88 is: 208,425.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,717.68 : 492,818.40 = 139,022.88 : x
  2. Step 2: Convert to fraction form
    328,717.68/492,818.40 = 139,022.88/x
  3. Step 3: Cross multiply
    328,717.68x = 492,818.40 × 139,022.88
  4. Step 4: Simplify right side
    328,717.68x = 68,513,033,284.99
  5. Step 5: Solve for x
    x = 68,513,033,284.99/328,717.68
  6. Step 6: Final answer
    x = 208,425.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.