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Finding the Fourth Proportional to 260,080.59, 390,233.57 and 91,721.22

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Solution

The fourth proportional to 260,080.59, 390,233.57 and 91,721.22 is: 137,621.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,080.59 : 390,233.57 = 91,721.22 : x
  2. Step 2: Convert to fraction form
    260,080.59/390,233.57 = 91,721.22/x
  3. Step 3: Cross multiply
    260,080.59x = 390,233.57 × 91,721.22
  4. Step 4: Simplify right side
    260,080.59x = 35,792,698,666.75
  5. Step 5: Solve for x
    x = 35,792,698,666.75/260,080.59
  6. Step 6: Final answer
    x = 137,621.57

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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.