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Finding the Fourth Proportional to 91,716.20, 128,533.90 and 91,716.20

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Solution

The fourth proportional to 91,716.20, 128,533.90 and 91,716.20 is: 128,533.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,716.20 : 128,533.90 = 91,716.20 : x
  2. Step 2: Convert to fraction form
    91,716.20/128,533.90 = 91,716.20/x
  3. Step 3: Cross multiply
    91,716.20x = 128,533.90 × 91,716.20
  4. Step 4: Simplify right side
    91,716.20x = 11,788,640,879.18
  5. Step 5: Solve for x
    x = 11,788,640,879.18/91,716.20
  6. Step 6: Final answer
    x = 128,533.90

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1.5x scale

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.