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Finding the Fourth Proportional to 926,872.74, 1,278,978.66 and 518,917.86

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Solution

The fourth proportional to 926,872.74, 1,278,978.66 and 518,917.86 is: 716,047.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    926,872.74 : 1,278,978.66 = 518,917.86 : x
  2. Step 2: Convert to fraction form
    926,872.74/1,278,978.66 = 518,917.86/x
  3. Step 3: Cross multiply
    926,872.74x = 1,278,978.66 × 518,917.86
  4. Step 4: Simplify right side
    926,872.74x = 663,684,869,232.87
  5. Step 5: Solve for x
    x = 663,684,869,232.87/926,872.74
  6. Step 6: Final answer
    x = 716,047.46

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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.