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Finding the Fourth Proportional to 716,018.27, 988,101.69 and 421,838.78

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Solution

The fourth proportional to 716,018.27, 988,101.69 and 421,838.78 is: 582,135.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,018.27 : 988,101.69 = 421,838.78 : x
  2. Step 2: Convert to fraction form
    716,018.27/988,101.69 = 421,838.78/x
  3. Step 3: Cross multiply
    716,018.27x = 988,101.69 × 421,838.78
  4. Step 4: Simplify right side
    716,018.27x = 416,819,611,425.54
  5. Step 5: Solve for x
    x = 416,819,611,425.54/716,018.27
  6. Step 6: Final answer
    x = 582,135.44

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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.