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Finding the Fourth Proportional to 85,412.40, 128,118.60 and 57,418.80

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Solution

The fourth proportional to 85,412.40, 128,118.60 and 57,418.80 is: 86,128.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,412.40 : 128,118.60 = 57,418.80 : x
  2. Step 2: Convert to fraction form
    85,412.40/128,118.60 = 57,418.80/x
  3. Step 3: Cross multiply
    85,412.40x = 128,118.60 × 57,418.80
  4. Step 4: Simplify right side
    85,412.40x = 7,356,416,269.68
  5. Step 5: Solve for x
    x = 7,356,416,269.68/85,412.40
  6. Step 6: Final answer
    x = 86,128.20

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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.