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Finding the Fourth Proportional to 86,458.40, 129,478.60 and 71,557.64

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Solution

The fourth proportional to 86,458.40, 129,478.60 and 71,557.64 is: 107,163.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,458.40 : 129,478.60 = 71,557.64 : x
  2. Step 2: Convert to fraction form
    86,458.40/129,478.60 = 71,557.64/x
  3. Step 3: Cross multiply
    86,458.40x = 129,478.60 × 71,557.64
  4. Step 4: Simplify right side
    86,458.40x = 9,265,183,046.50
  5. Step 5: Solve for x
    x = 9,265,183,046.50/86,458.40
  6. Step 6: Final answer
    x = 107,163.48

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1.5x scale

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.