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Finding the Fourth Proportional to 390,113.01, 585,338.54 and 137,573.93

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Solution

The fourth proportional to 390,113.01, 585,338.54 and 137,573.93 is: 206,420.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,113.01 : 585,338.54 = 137,573.93 : x
  2. Step 2: Convert to fraction form
    390,113.01/585,338.54 = 137,573.93/x
  3. Step 3: Cross multiply
    390,113.01x = 585,338.54 × 137,573.93
  4. Step 4: Simplify right side
    390,113.01x = 80,527,324,103.74
  5. Step 5: Solve for x
    x = 80,527,324,103.74/390,113.01
  6. Step 6: Final answer
    x = 206,420.50

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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.