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Finding the Fourth Proportional to 219,986.90, 329,915.55 and 86,822.90

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Solution

The fourth proportional to 219,986.90, 329,915.55 and 86,822.90 is: 130,208.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,986.90 : 329,915.55 = 86,822.90 : x
  2. Step 2: Convert to fraction form
    219,986.90/329,915.55 = 86,822.90/x
  3. Step 3: Cross multiply
    219,986.90x = 329,915.55 × 86,822.90
  4. Step 4: Simplify right side
    219,986.90x = 28,644,224,806.10
  5. Step 5: Solve for x
    x = 28,644,224,806.10/219,986.90
  6. Step 6: Final answer
    x = 130,208.78

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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.