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Finding the Fourth Proportional to 128,712.10, 193,068.15 and 106,404.70

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Solution

The fourth proportional to 128,712.10, 193,068.15 and 106,404.70 is: 159,607.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,712.10 : 193,068.15 = 106,404.70 : x
  2. Step 2: Convert to fraction form
    128,712.10/193,068.15 = 106,404.70/x
  3. Step 3: Cross multiply
    128,712.10x = 193,068.15 × 106,404.70
  4. Step 4: Simplify right side
    128,712.10x = 20,543,358,580.31
  5. Step 5: Solve for x
    x = 20,543,358,580.31/128,712.10
  6. Step 6: Final answer
    x = 159,607.05

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1.5x scale

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.