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Finding the Fourth Proportional to 257,905.60, 386,858.40 and 70,917.10

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Solution

The fourth proportional to 257,905.60, 386,858.40 and 70,917.10 is: 106,375.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,905.60 : 386,858.40 = 70,917.10 : x
  2. Step 2: Convert to fraction form
    257,905.60/386,858.40 = 70,917.10/x
  3. Step 3: Cross multiply
    257,905.60x = 386,858.40 × 70,917.10
  4. Step 4: Simplify right side
    257,905.60x = 27,434,875,838.64
  5. Step 5: Solve for x
    x = 27,434,875,838.64/257,905.60
  6. Step 6: Final answer
    x = 106,375.65

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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.