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Finding the Fourth Proportional to 91,723.20, 128,136 and 91,723.20

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Solution

The fourth proportional to 91,723.20, 128,136 and 91,723.20 is: 128,136.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,723.20 : 128,136 = 91,723.20 : x
  2. Step 2: Convert to fraction form
    91,723.20/128,136 = 91,723.20/x
  3. Step 3: Cross multiply
    91,723.20x = 128,136 × 91,723.20
  4. Step 4: Simplify right side
    91,723.20x = 11,753,043,955.20
  5. Step 5: Solve for x
    x = 11,753,043,955.20/91,723.20
  6. Step 6: Final answer
    x = 128,136.00

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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.