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Finding the Fourth Proportional to 85,934.80, 128,999.40 and 66,300.40

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Solution

The fourth proportional to 85,934.80, 128,999.40 and 66,300.40 is: 99,525.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,934.80 : 128,999.40 = 66,300.40 : x
  2. Step 2: Convert to fraction form
    85,934.80/128,999.40 = 66,300.40/x
  3. Step 3: Cross multiply
    85,934.80x = 128,999.40 × 66,300.40
  4. Step 4: Simplify right side
    85,934.80x = 8,552,711,819.76
  5. Step 5: Solve for x
    x = 8,552,711,819.76/85,934.80
  6. Step 6: Final answer
    x = 99,525.59

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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.