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Finding the Fourth Proportional to 612,084.60, 918,126.90 and 212,765.74

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Solution

The fourth proportional to 612,084.60, 918,126.90 and 212,765.74 is: 319,148.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,084.60 : 918,126.90 = 212,765.74 : x
  2. Step 2: Convert to fraction form
    612,084.60/918,126.90 = 212,765.74/x
  3. Step 3: Cross multiply
    612,084.60x = 918,126.90 × 212,765.74
  4. Step 4: Simplify right side
    612,084.60x = 195,345,946,997.09
  5. Step 5: Solve for x
    x = 195,345,946,997.09/612,084.60
  6. Step 6: Final answer
    x = 319,148.61

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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.