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Finding the Fourth Proportional to 85,857.47, 128,154.57 and 79,840.79

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Solution

The fourth proportional to 85,857.47, 128,154.57 and 79,840.79 is: 119,173.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,857.47 : 128,154.57 = 79,840.79 : x
  2. Step 2: Convert to fraction form
    85,857.47/128,154.57 = 79,840.79/x
  3. Step 3: Cross multiply
    85,857.47x = 128,154.57 × 79,840.79
  4. Step 4: Simplify right side
    85,857.47x = 10,231,961,470.14
  5. Step 5: Solve for x
    x = 10,231,961,470.14/85,857.47
  6. Step 6: Final answer
    x = 119,173.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.