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Finding the Fourth Proportional to 153,697.79, 212,104.18 and 85,719.15

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Solution

The fourth proportional to 153,697.79, 212,104.18 and 85,719.15 is: 118,293.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,697.79 : 212,104.18 = 85,719.15 : x
  2. Step 2: Convert to fraction form
    153,697.79/212,104.18 = 85,719.15/x
  3. Step 3: Cross multiply
    153,697.79x = 212,104.18 × 85,719.15
  4. Step 4: Simplify right side
    153,697.79x = 18,181,390,021.05
  5. Step 5: Solve for x
    x = 18,181,390,021.05/153,697.79
  6. Step 6: Final answer
    x = 118,293.11

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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.