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Finding the Fourth Proportional to 157,659, 217,574.01 and 86,043.60

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Solution

The fourth proportional to 157,659, 217,574.01 and 86,043.60 is: 118,742.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,659 : 217,574.01 = 86,043.60 : x
  2. Step 2: Convert to fraction form
    157,659/217,574.01 = 86,043.60/x
  3. Step 3: Cross multiply
    157,659x = 217,574.01 × 86,043.60
  4. Step 4: Simplify right side
    157,659x = 18,720,851,086.84
  5. Step 5: Solve for x
    x = 18,720,851,086.84/157,659
  6. Step 6: Final answer
    x = 118,742.67

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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.