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Finding the Fourth Proportional to 643,314.25, 887,774.55 and 356,834.34

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Solution

The fourth proportional to 643,314.25, 887,774.55 and 356,834.34 is: 492,431.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,314.25 : 887,774.55 = 356,834.34 : x
  2. Step 2: Convert to fraction form
    643,314.25/887,774.55 = 356,834.34/x
  3. Step 3: Cross multiply
    643,314.25x = 887,774.55 × 356,834.34
  4. Step 4: Simplify right side
    643,314.25x = 316,788,442,535.75
  5. Step 5: Solve for x
    x = 316,788,442,535.75/643,314.25
  6. Step 6: Final answer
    x = 492,431.87

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Double scale
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Similar ratio
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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.