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Finding the Fourth Proportional to 421,279.40, 631,919.10 and 210,841.40

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Solution

The fourth proportional to 421,279.40, 631,919.10 and 210,841.40 is: 316,262.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,279.40 : 631,919.10 = 210,841.40 : x
  2. Step 2: Convert to fraction form
    421,279.40/631,919.10 = 210,841.40/x
  3. Step 3: Cross multiply
    421,279.40x = 631,919.10 × 210,841.40
  4. Step 4: Simplify right side
    421,279.40x = 133,234,707,730.74
  5. Step 5: Solve for x
    x = 133,234,707,730.74/421,279.40
  6. Step 6: Final answer
    x = 316,262.10

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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.