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Finding the Fourth Proportional to 70,907.60, 106,231.80 and 57,688.40

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Solution

The fourth proportional to 70,907.60, 106,231.80 and 57,688.40 is: 86,427.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,907.60 : 106,231.80 = 57,688.40 : x
  2. Step 2: Convert to fraction form
    70,907.60/106,231.80 = 57,688.40/x
  3. Step 3: Cross multiply
    70,907.60x = 106,231.80 × 57,688.40
  4. Step 4: Simplify right side
    70,907.60x = 6,128,342,571.12
  5. Step 5: Solve for x
    x = 6,128,342,571.12/70,907.60
  6. Step 6: Final answer
    x = 86,427.16

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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.