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Finding the Fourth Proportional to 260,069.90, 390,217.55 and 91,710.53

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Solution

The fourth proportional to 260,069.90, 390,217.55 and 91,710.53 is: 137,605.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,069.90 : 390,217.55 = 91,710.53 : x
  2. Step 2: Convert to fraction form
    260,069.90/390,217.55 = 91,710.53/x
  3. Step 3: Cross multiply
    260,069.90x = 390,217.55 × 91,710.53
  4. Step 4: Simplify right side
    260,069.90x = 35,787,055,916.16
  5. Step 5: Solve for x
    x = 35,787,055,916.16/260,069.90
  6. Step 6: Final answer
    x = 137,605.53

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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.