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Finding the Fourth Proportional to 430,645.60, 645,968.40 and 131,123.80

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Solution

The fourth proportional to 430,645.60, 645,968.40 and 131,123.80 is: 196,685.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    430,645.60 : 645,968.40 = 131,123.80 : x
  2. Step 2: Convert to fraction form
    430,645.60/645,968.40 = 131,123.80/x
  3. Step 3: Cross multiply
    430,645.60x = 645,968.40 × 131,123.80
  4. Step 4: Simplify right side
    430,645.60x = 84,701,831,287.92
  5. Step 5: Solve for x
    x = 84,701,831,287.92/430,645.60
  6. Step 6: Final answer
    x = 196,685.70

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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.