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Finding the Fourth Proportional to 386,296.40, 578,753.40 and 331,000.40

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Solution

The fourth proportional to 386,296.40, 578,753.40 and 331,000.40 is: 495,908.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,296.40 : 578,753.40 = 331,000.40 : x
  2. Step 2: Convert to fraction form
    386,296.40/578,753.40 = 331,000.40/x
  3. Step 3: Cross multiply
    386,296.40x = 578,753.40 × 331,000.40
  4. Step 4: Simplify right side
    386,296.40x = 191,567,606,901.36
  5. Step 5: Solve for x
    x = 191,567,606,901.36/386,296.40
  6. Step 6: Final answer
    x = 495,908.34

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1.5x scale

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.