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Finding the Fourth Proportional to 638,853.65, 958,073.16 and 212,274.92

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Solution

The fourth proportional to 638,853.65, 958,073.16 and 212,274.92 is: 318,343.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,853.65 : 958,073.16 = 212,274.92 : x
  2. Step 2: Convert to fraction form
    638,853.65/958,073.16 = 212,274.92/x
  3. Step 3: Cross multiply
    638,853.65x = 958,073.16 × 212,274.92
  4. Step 4: Simplify right side
    638,853.65x = 203,374,903,393.15
  5. Step 5: Solve for x
    x = 203,374,903,393.15/638,853.65
  6. Step 6: Final answer
    x = 318,343.49

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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.