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Finding the Fourth Proportional to 986,640.76, 1,479,361.84 and 386,883.40

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Solution

The fourth proportional to 986,640.76, 1,479,361.84 and 386,883.40 is: 580,090.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    986,640.76 : 1,479,361.84 = 386,883.40 : x
  2. Step 2: Convert to fraction form
    986,640.76/1,479,361.84 = 386,883.40/x
  3. Step 3: Cross multiply
    986,640.76x = 1,479,361.84 × 386,883.40
  4. Step 4: Simplify right side
    986,640.76x = 572,340,538,489.46
  5. Step 5: Solve for x
    x = 572,340,538,489.46/986,640.76
  6. Step 6: Final answer
    x = 580,090.10

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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.