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Finding the Fourth Proportional to 390,332.95, 585,100.60 and 221,496.75

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Solution

The fourth proportional to 390,332.95, 585,100.60 and 221,496.75 is: 332,018.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,332.95 : 585,100.60 = 221,496.75 : x
  2. Step 2: Convert to fraction form
    390,332.95/585,100.60 = 221,496.75/x
  3. Step 3: Cross multiply
    390,332.95x = 585,100.60 × 221,496.75
  4. Step 4: Simplify right side
    390,332.95x = 129,597,880,769.31
  5. Step 5: Solve for x
    x = 129,597,880,769.31/390,332.95
  6. Step 6: Final answer
    x = 332,018.81

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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.