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Finding the Fourth Proportional to 153,812.79, 212,261.39 and 85,825.64

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Solution

The fourth proportional to 153,812.79, 212,261.39 and 85,825.64 is: 118,439.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,812.79 : 212,261.39 = 85,825.64 : x
  2. Step 2: Convert to fraction form
    153,812.79/212,261.39 = 85,825.64/x
  3. Step 3: Cross multiply
    153,812.79x = 212,261.39 × 85,825.64
  4. Step 4: Simplify right side
    153,812.79x = 18,217,468,582.73
  5. Step 5: Solve for x
    x = 18,217,468,582.73/153,812.79
  6. Step 6: Final answer
    x = 118,439.23

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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.