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Finding the Fourth Proportional to 280,838.80, 421,258.20 and 217,853.20

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Solution

The fourth proportional to 280,838.80, 421,258.20 and 217,853.20 is: 326,779.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,838.80 : 421,258.20 = 217,853.20 : x
  2. Step 2: Convert to fraction form
    280,838.80/421,258.20 = 217,853.20/x
  3. Step 3: Cross multiply
    280,838.80x = 421,258.20 × 217,853.20
  4. Step 4: Simplify right side
    280,838.80x = 91,772,446,896.24
  5. Step 5: Solve for x
    x = 91,772,446,896.24/280,838.80
  6. Step 6: Final answer
    x = 326,779.80

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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.