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Finding the Fourth Proportional to 91,284.64, 136,807.61 and 66,069.05

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Solution

The fourth proportional to 91,284.64, 136,807.61 and 66,069.05 is: 99,017.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,284.64 : 136,807.61 = 66,069.05 : x
  2. Step 2: Convert to fraction form
    91,284.64/136,807.61 = 66,069.05/x
  3. Step 3: Cross multiply
    91,284.64x = 136,807.61 × 66,069.05
  4. Step 4: Simplify right side
    91,284.64x = 9,038,747,811.09
  5. Step 5: Solve for x
    x = 9,038,747,811.09/91,284.64
  6. Step 6: Final answer
    x = 99,017.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.