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Finding the Fourth Proportional to 91,719.45, 128,130.75 and 91,719.45

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Solution

The fourth proportional to 91,719.45, 128,130.75 and 91,719.45 is: 128,130.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,719.45 : 128,130.75 = 91,719.45 : x
  2. Step 2: Convert to fraction form
    91,719.45/128,130.75 = 91,719.45/x
  3. Step 3: Cross multiply
    91,719.45x = 128,130.75 × 91,719.45
  4. Step 4: Simplify right side
    91,719.45x = 11,752,081,918.09
  5. Step 5: Solve for x
    x = 11,752,081,918.09/91,719.45
  6. Step 6: Final answer
    x = 128,130.75

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.