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Finding the Fourth Proportional to 427,989.84, 642,091.56 and 128,475.96

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Solution

The fourth proportional to 427,989.84, 642,091.56 and 128,475.96 is: 192,746.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,989.84 : 642,091.56 = 128,475.96 : x
  2. Step 2: Convert to fraction form
    427,989.84/642,091.56 = 128,475.96/x
  3. Step 3: Cross multiply
    427,989.84x = 642,091.56 × 128,475.96
  4. Step 4: Simplify right side
    427,989.84x = 82,493,329,578.90
  5. Step 5: Solve for x
    x = 82,493,329,578.90/427,989.84
  6. Step 6: Final answer
    x = 192,746.00

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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.