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Finding the Fourth Proportional to 81,866.04, 112,485.55 and 65,069.88

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Solution

The fourth proportional to 81,866.04, 112,485.55 and 65,069.88 is: 89,407.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,866.04 : 112,485.55 = 65,069.88 : x
  2. Step 2: Convert to fraction form
    81,866.04/112,485.55 = 65,069.88/x
  3. Step 3: Cross multiply
    81,866.04x = 112,485.55 × 65,069.88
  4. Step 4: Simplify right side
    81,866.04x = 7,319,421,240.23
  5. Step 5: Solve for x
    x = 7,319,421,240.23/81,866.04
  6. Step 6: Final answer
    x = 89,407.30

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.