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Finding the Fourth Proportional to 212,926.60, 319,389.90 and 156,939.40

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Solution

The fourth proportional to 212,926.60, 319,389.90 and 156,939.40 is: 235,409.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,926.60 : 319,389.90 = 156,939.40 : x
  2. Step 2: Convert to fraction form
    212,926.60/319,389.90 = 156,939.40/x
  3. Step 3: Cross multiply
    212,926.60x = 319,389.90 × 156,939.40
  4. Step 4: Simplify right side
    212,926.60x = 50,124,859,272.06
  5. Step 5: Solve for x
    x = 50,124,859,272.06/212,926.60
  6. Step 6: Final answer
    x = 235,409.10

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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.