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Finding the Fourth Proportional to 91,767.10, 128,211.50 and 91,767.10

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Solution

The fourth proportional to 91,767.10, 128,211.50 and 91,767.10 is: 128,211.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,767.10 : 128,211.50 = 91,767.10 : x
  2. Step 2: Convert to fraction form
    91,767.10/128,211.50 = 91,767.10/x
  3. Step 3: Cross multiply
    91,767.10x = 128,211.50 × 91,767.10
  4. Step 4: Simplify right side
    91,767.10x = 11,765,597,541.65
  5. Step 5: Solve for x
    x = 11,765,597,541.65/91,767.10
  6. Step 6: Final answer
    x = 128,211.50

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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.