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Finding the Fourth Proportional to 260,143.01, 390,251.70 and 80,243.63

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Solution

The fourth proportional to 260,143.01, 390,251.70 and 80,243.63 is: 120,376.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,143.01 : 390,251.70 = 80,243.63 : x
  2. Step 2: Convert to fraction form
    260,143.01/390,251.70 = 80,243.63/x
  3. Step 3: Cross multiply
    260,143.01x = 390,251.70 × 80,243.63
  4. Step 4: Simplify right side
    260,143.01x = 31,315,210,669.19
  5. Step 5: Solve for x
    x = 31,315,210,669.19/260,143.01
  6. Step 6: Final answer
    x = 120,376.91

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1.5x scale

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.