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Finding the Fourth Proportional to 260,506.85, 390,679.47 and 91,988.37

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Solution

The fourth proportional to 260,506.85, 390,679.47 and 91,988.37 is: 137,954.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,506.85 : 390,679.47 = 91,988.37 : x
  2. Step 2: Convert to fraction form
    260,506.85/390,679.47 = 91,988.37/x
  3. Step 3: Cross multiply
    260,506.85x = 390,679.47 × 91,988.37
  4. Step 4: Simplify right side
    260,506.85x = 35,937,967,637.76
  5. Step 5: Solve for x
    x = 35,937,967,637.76/260,506.85
  6. Step 6: Final answer
    x = 137,954.02

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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.