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Finding the Fourth Proportional to 390,452.61, 585,009.66 and 262,128.54

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Solution

The fourth proportional to 390,452.61, 585,009.66 and 262,128.54 is: 392,743.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,452.61 : 585,009.66 = 262,128.54 : x
  2. Step 2: Convert to fraction form
    390,452.61/585,009.66 = 262,128.54/x
  3. Step 3: Cross multiply
    390,452.61x = 585,009.66 × 262,128.54
  4. Step 4: Simplify right side
    390,452.61x = 153,347,728,061.70
  5. Step 5: Solve for x
    x = 153,347,728,061.70/390,452.61
  6. Step 6: Final answer
    x = 392,743.51

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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.