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Finding the Fourth Proportional to 85,860.30, 128,790.45 and 73,175.70

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Solution

The fourth proportional to 85,860.30, 128,790.45 and 73,175.70 is: 109,763.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,860.30 : 128,790.45 = 73,175.70 : x
  2. Step 2: Convert to fraction form
    85,860.30/128,790.45 = 73,175.70/x
  3. Step 3: Cross multiply
    85,860.30x = 128,790.45 × 73,175.70
  4. Step 4: Simplify right side
    85,860.30x = 9,424,331,332.07
  5. Step 5: Solve for x
    x = 9,424,331,332.07/85,860.30
  6. Step 6: Final answer
    x = 109,763.55

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1.5x scale

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.