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Finding the Fourth Proportional to 91,889.20, 128,776.10 and 91,889.20

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Solution

The fourth proportional to 91,889.20, 128,776.10 and 91,889.20 is: 128,776.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,889.20 : 128,776.10 = 91,889.20 : x
  2. Step 2: Convert to fraction form
    91,889.20/128,776.10 = 91,889.20/x
  3. Step 3: Cross multiply
    91,889.20x = 128,776.10 × 91,889.20
  4. Step 4: Simplify right side
    91,889.20x = 11,833,132,808.12
  5. Step 5: Solve for x
    x = 11,833,132,808.12/91,889.20
  6. Step 6: Final answer
    x = 128,776.10

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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.