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Finding the Fourth Proportional to 90,809.64, 136,214.46 and 28,485

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Solution

The fourth proportional to 90,809.64, 136,214.46 and 28,485 is: 42,727.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,809.64 : 136,214.46 = 28,485 : x
  2. Step 2: Convert to fraction form
    90,809.64/136,214.46 = 28,485/x
  3. Step 3: Cross multiply
    90,809.64x = 136,214.46 × 28,485
  4. Step 4: Simplify right side
    90,809.64x = 3,880,068,893.10
  5. Step 5: Solve for x
    x = 3,880,068,893.10/90,809.64
  6. Step 6: Final answer
    x = 42,727.50

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Double scale
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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.