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Finding the Fourth Proportional to 636,389.28, 878,221.08 and 349,911.72

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Solution

The fourth proportional to 636,389.28, 878,221.08 and 349,911.72 is: 482,880.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,389.28 : 878,221.08 = 349,911.72 : x
  2. Step 2: Convert to fraction form
    636,389.28/878,221.08 = 349,911.72/x
  3. Step 3: Cross multiply
    636,389.28x = 878,221.08 × 349,911.72
  4. Step 4: Simplify right side
    636,389.28x = 307,299,848,643.06
  5. Step 5: Solve for x
    x = 307,299,848,643.06/636,389.28
  6. Step 6: Final answer
    x = 482,880.30

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1.5x scale

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.