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Finding the Fourth Proportional to 386,440.80, 579,661.20 and 316,399.20

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Solution

The fourth proportional to 386,440.80, 579,661.20 and 316,399.20 is: 474,598.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,440.80 : 579,661.20 = 316,399.20 : x
  2. Step 2: Convert to fraction form
    386,440.80/579,661.20 = 316,399.20/x
  3. Step 3: Cross multiply
    386,440.80x = 579,661.20 × 316,399.20
  4. Step 4: Simplify right side
    386,440.80x = 183,404,339,951.04
  5. Step 5: Solve for x
    x = 183,404,339,951.04/386,440.80
  6. Step 6: Final answer
    x = 474,598.80

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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.