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Finding the Fourth Proportional to 665,476.08, 918,800.39 and 393,631.30

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Solution

The fourth proportional to 665,476.08, 918,800.39 and 393,631.30 is: 543,473.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,476.08 : 918,800.39 = 393,631.30 : x
  2. Step 2: Convert to fraction form
    665,476.08/918,800.39 = 393,631.30/x
  3. Step 3: Cross multiply
    665,476.08x = 918,800.39 × 393,631.30
  4. Step 4: Simplify right side
    665,476.08x = 361,668,587,813.45
  5. Step 5: Solve for x
    x = 361,668,587,813.45/665,476.08
  6. Step 6: Final answer
    x = 543,473.46

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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.