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Finding the Fourth Proportional to 280,539.60, 420,809.40 and 90,999.60

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Solution

The fourth proportional to 280,539.60, 420,809.40 and 90,999.60 is: 136,499.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,539.60 : 420,809.40 = 90,999.60 : x
  2. Step 2: Convert to fraction form
    280,539.60/420,809.40 = 90,999.60/x
  3. Step 3: Cross multiply
    280,539.60x = 420,809.40 × 90,999.60
  4. Step 4: Simplify right side
    280,539.60x = 38,293,487,076.24
  5. Step 5: Solve for x
    x = 38,293,487,076.24/280,539.60
  6. Step 6: Final answer
    x = 136,499.40

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Similar ratio
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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.