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Finding the Fourth Proportional to 156,638.78, 216,155.72 and 85,017.26

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Solution

The fourth proportional to 156,638.78, 216,155.72 and 85,017.26 is: 117,320.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,638.78 : 216,155.72 = 85,017.26 : x
  2. Step 2: Convert to fraction form
    156,638.78/216,155.72 = 85,017.26/x
  3. Step 3: Cross multiply
    156,638.78x = 216,155.72 × 85,017.26
  4. Step 4: Simplify right side
    156,638.78x = 18,376,966,622.64
  5. Step 5: Solve for x
    x = 18,376,966,622.64/156,638.78
  6. Step 6: Final answer
    x = 117,320.67

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1.5x scale

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.