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Finding the Fourth Proportional to 666,414.08, 919,359.32 and 390,632.12

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Solution

The fourth proportional to 666,414.08, 919,359.32 and 390,632.12 is: 538,901.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,414.08 : 919,359.32 = 390,632.12 : x
  2. Step 2: Convert to fraction form
    666,414.08/919,359.32 = 390,632.12/x
  3. Step 3: Cross multiply
    666,414.08x = 919,359.32 × 390,632.12
  4. Step 4: Simplify right side
    666,414.08x = 359,131,273,663.40
  5. Step 5: Solve for x
    x = 359,131,273,663.40/666,414.08
  6. Step 6: Final answer
    x = 538,901.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.