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Finding the Fourth Proportional to 639,440.48, 958,953.06 and 212,861.72

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Solution

The fourth proportional to 639,440.48, 958,953.06 and 212,861.72 is: 319,223.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,440.48 : 958,953.06 = 212,861.72 : x
  2. Step 2: Convert to fraction form
    639,440.48/958,953.06 = 212,861.72/x
  3. Step 3: Cross multiply
    639,440.48x = 958,953.06 × 212,861.72
  4. Step 4: Simplify right side
    639,440.48x = 204,124,397,750.86
  5. Step 5: Solve for x
    x = 204,124,397,750.86/639,440.48
  6. Step 6: Final answer
    x = 319,223.45

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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.