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Finding the Fourth Proportional to 91,705.80, 128,621.40 and 91,705.80

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Solution

The fourth proportional to 91,705.80, 128,621.40 and 91,705.80 is: 128,621.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,705.80 : 128,621.40 = 91,705.80 : x
  2. Step 2: Convert to fraction form
    91,705.80/128,621.40 = 91,705.80/x
  3. Step 3: Cross multiply
    91,705.80x = 128,621.40 × 91,705.80
  4. Step 4: Simplify right side
    91,705.80x = 11,795,328,384.12
  5. Step 5: Solve for x
    x = 11,795,328,384.12/91,705.80
  6. Step 6: Final answer
    x = 128,621.40

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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.