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Finding the Fourth Proportional to 86,574.60, 129,861.90 and 39,918.60

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Solution

The fourth proportional to 86,574.60, 129,861.90 and 39,918.60 is: 59,877.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,574.60 : 129,861.90 = 39,918.60 : x
  2. Step 2: Convert to fraction form
    86,574.60/129,861.90 = 39,918.60/x
  3. Step 3: Cross multiply
    86,574.60x = 129,861.90 × 39,918.60
  4. Step 4: Simplify right side
    86,574.60x = 5,183,905,241.34
  5. Step 5: Solve for x
    x = 5,183,905,241.34/86,574.60
  6. Step 6: Final answer
    x = 59,877.90

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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.