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Finding the Fourth Proportional to 81,980.80, 115,006.40 and 81,980.80

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Solution

The fourth proportional to 81,980.80, 115,006.40 and 81,980.80 is: 115,006.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,980.80 : 115,006.40 = 81,980.80 : x
  2. Step 2: Convert to fraction form
    81,980.80/115,006.40 = 81,980.80/x
  3. Step 3: Cross multiply
    81,980.80x = 115,006.40 × 81,980.80
  4. Step 4: Simplify right side
    81,980.80x = 9,428,316,677.12
  5. Step 5: Solve for x
    x = 9,428,316,677.12/81,980.80
  6. Step 6: Final answer
    x = 115,006.40

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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.