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Finding the Fourth Proportional to 261,635.40, 391,869.90 and 214,979.40

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Solution

The fourth proportional to 261,635.40, 391,869.90 and 214,979.40 is: 321,989.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,635.40 : 391,869.90 = 214,979.40 : x
  2. Step 2: Convert to fraction form
    261,635.40/391,869.90 = 214,979.40/x
  3. Step 3: Cross multiply
    261,635.40x = 391,869.90 × 214,979.40
  4. Step 4: Simplify right side
    261,635.40x = 84,243,955,980.06
  5. Step 5: Solve for x
    x = 84,243,955,980.06/261,635.40
  6. Step 6: Final answer
    x = 321,989.90

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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.