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Finding the Fourth Proportional to 191,801.10, 287,701.65 and 121,989.90

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Solution

The fourth proportional to 191,801.10, 287,701.65 and 121,989.90 is: 182,984.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,801.10 : 287,701.65 = 121,989.90 : x
  2. Step 2: Convert to fraction form
    191,801.10/287,701.65 = 121,989.90/x
  3. Step 3: Cross multiply
    191,801.10x = 287,701.65 × 121,989.90
  4. Step 4: Simplify right side
    191,801.10x = 35,096,695,513.34
  5. Step 5: Solve for x
    x = 35,096,695,513.34/191,801.10
  6. Step 6: Final answer
    x = 182,984.85

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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.