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Finding the Fourth Proportional to 261,028.40, 390,959.40 and 214,372.40

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Solution

The fourth proportional to 261,028.40, 390,959.40 and 214,372.40 is: 321,079.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,028.40 : 390,959.40 = 214,372.40 : x
  2. Step 2: Convert to fraction form
    261,028.40/390,959.40 = 214,372.40/x
  3. Step 3: Cross multiply
    261,028.40x = 390,959.40 × 214,372.40
  4. Step 4: Simplify right side
    261,028.40x = 83,810,904,880.56
  5. Step 5: Solve for x
    x = 83,810,904,880.56/261,028.40
  6. Step 6: Final answer
    x = 321,079.64

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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.