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Finding the Fourth Proportional to 390,760.96, 586,012.92 and 137,995.60

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Solution

The fourth proportional to 390,760.96, 586,012.92 and 137,995.60 is: 206,948.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,760.96 : 586,012.92 = 137,995.60 : x
  2. Step 2: Convert to fraction form
    390,760.96/586,012.92 = 137,995.60/x
  3. Step 3: Cross multiply
    390,760.96x = 586,012.92 × 137,995.60
  4. Step 4: Simplify right side
    390,760.96x = 80,867,204,503.15
  5. Step 5: Solve for x
    x = 80,867,204,503.15/390,760.96
  6. Step 6: Final answer
    x = 206,948.01

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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.