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Finding the Fourth Proportional to 86,606.80, 129,845.40 and 47,208.40

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Solution

The fourth proportional to 86,606.80, 129,845.40 and 47,208.40 is: 70,777.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,606.80 : 129,845.40 = 47,208.40 : x
  2. Step 2: Convert to fraction form
    86,606.80/129,845.40 = 47,208.40/x
  3. Step 3: Cross multiply
    86,606.80x = 129,845.40 × 47,208.40
  4. Step 4: Simplify right side
    86,606.80x = 6,129,793,581.36
  5. Step 5: Solve for x
    x = 6,129,793,581.36/86,606.80
  6. Step 6: Final answer
    x = 70,777.28

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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.