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Finding the Fourth Proportional to 86,666.40, 129,934.80 and 36,705.60

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Solution

The fourth proportional to 86,666.40, 129,934.80 and 36,705.60 is: 55,030.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,666.40 : 129,934.80 = 36,705.60 : x
  2. Step 2: Convert to fraction form
    86,666.40/129,934.80 = 36,705.60/x
  3. Step 3: Cross multiply
    86,666.40x = 129,934.80 × 36,705.60
  4. Step 4: Simplify right side
    86,666.40x = 4,769,334,794.88
  5. Step 5: Solve for x
    x = 4,769,334,794.88/86,666.40
  6. Step 6: Final answer
    x = 55,030.96

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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.