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Finding the Fourth Proportional to 261,639.40, 391,875.90 and 214,983.40

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Solution

The fourth proportional to 261,639.40, 391,875.90 and 214,983.40 is: 321,995.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,639.40 : 391,875.90 = 214,983.40 : x
  2. Step 2: Convert to fraction form
    261,639.40/391,875.90 = 214,983.40/x
  3. Step 3: Cross multiply
    261,639.40x = 391,875.90 × 214,983.40
  4. Step 4: Simplify right side
    261,639.40x = 84,246,813,360.06
  5. Step 5: Solve for x
    x = 84,246,813,360.06/261,639.40
  6. Step 6: Final answer
    x = 321,995.90

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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.