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Finding the Fourth Proportional to 85,784.80, 128,689.62 and 26,625.25

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Solution

The fourth proportional to 85,784.80, 128,689.62 and 26,625.25 is: 39,941.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,784.80 : 128,689.62 = 26,625.25 : x
  2. Step 2: Convert to fraction form
    85,784.80/128,689.62 = 26,625.25/x
  3. Step 3: Cross multiply
    85,784.80x = 128,689.62 × 26,625.25
  4. Step 4: Simplify right side
    85,784.80x = 3,426,393,304.91
  5. Step 5: Solve for x
    x = 3,426,393,304.91/85,784.80
  6. Step 6: Final answer
    x = 39,941.73

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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.