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Finding the Fourth Proportional to 878,417, 1,317,625.50 and 279,379.40

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Solution

The fourth proportional to 878,417, 1,317,625.50 and 279,379.40 is: 419,069.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,417 : 1,317,625.50 = 279,379.40 : x
  2. Step 2: Convert to fraction form
    878,417/1,317,625.50 = 279,379.40/x
  3. Step 3: Cross multiply
    878,417x = 1,317,625.50 × 279,379.40
  4. Step 4: Simplify right side
    878,417x = 368,117,421,614.70
  5. Step 5: Solve for x
    x = 368,117,421,614.70/878,417
  6. Step 6: Final answer
    x = 419,069.10

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Similar ratio
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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.