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Finding the Fourth Proportional to 547,781.40, 821,672.10 and 311,585.40

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Solution

The fourth proportional to 547,781.40, 821,672.10 and 311,585.40 is: 467,378.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    547,781.40 : 821,672.10 = 311,585.40 : x
  2. Step 2: Convert to fraction form
    547,781.40/821,672.10 = 311,585.40/x
  3. Step 3: Cross multiply
    547,781.40x = 821,672.10 × 311,585.40
  4. Step 4: Simplify right side
    547,781.40x = 256,021,029,947.34
  5. Step 5: Solve for x
    x = 256,021,029,947.34/547,781.40
  6. Step 6: Final answer
    x = 467,378.10

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.