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Finding the Fourth Proportional to 90,630.90, 135,946.35 and 31,460.40

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Solution

The fourth proportional to 90,630.90, 135,946.35 and 31,460.40 is: 47,190.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,630.90 : 135,946.35 = 31,460.40 : x
  2. Step 2: Convert to fraction form
    90,630.90/135,946.35 = 31,460.40/x
  3. Step 3: Cross multiply
    90,630.90x = 135,946.35 × 31,460.40
  4. Step 4: Simplify right side
    90,630.90x = 4,276,926,549.54
  5. Step 5: Solve for x
    x = 4,276,926,549.54/90,630.90
  6. Step 6: Final answer
    x = 47,190.60

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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.