Home / 280,915.73-421,385.90-81,256.30

Finding the Fourth Proportional to 280,915.73, 421,385.90 and 81,256.30

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Solution

The fourth proportional to 280,915.73, 421,385.90 and 81,256.30 is: 121,888.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,915.73 : 421,385.90 = 81,256.30 : x
  2. Step 2: Convert to fraction form
    280,915.73/421,385.90 = 81,256.30/x
  3. Step 3: Cross multiply
    280,915.73x = 421,385.90 × 81,256.30
  4. Step 4: Simplify right side
    280,915.73x = 34,240,256,592.96
  5. Step 5: Solve for x
    x = 34,240,256,592.96/280,915.73
  6. Step 6: Final answer
    x = 121,888.00

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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.