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Finding the Fourth Proportional to 85,613.80, 128,420.70 and 30,209.80

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Solution

The fourth proportional to 85,613.80, 128,420.70 and 30,209.80 is: 45,314.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,613.80 : 128,420.70 = 30,209.80 : x
  2. Step 2: Convert to fraction form
    85,613.80/128,420.70 = 30,209.80/x
  3. Step 3: Cross multiply
    85,613.80x = 128,420.70 × 30,209.80
  4. Step 4: Simplify right side
    85,613.80x = 3,879,563,662.86
  5. Step 5: Solve for x
    x = 3,879,563,662.86/85,613.80
  6. Step 6: Final answer
    x = 45,314.70

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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.