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Finding the Fourth Proportional to 687,920.32, 949,278 and 386,056

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Solution

The fourth proportional to 687,920.32, 949,278 and 386,056 is: 532,728.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,920.32 : 949,278 = 386,056 : x
  2. Step 2: Convert to fraction form
    687,920.32/949,278 = 386,056/x
  3. Step 3: Cross multiply
    687,920.32x = 949,278 × 386,056
  4. Step 4: Simplify right side
    687,920.32x = 366,474,467,568
  5. Step 5: Solve for x
    x = 366,474,467,568/687,920.32
  6. Step 6: Final answer
    x = 532,728.07

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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.