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Finding the Fourth Proportional to 85,678.90, 128,452.43 and 43,524.34

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Solution

The fourth proportional to 85,678.90, 128,452.43 and 43,524.34 is: 65,253.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,678.90 : 128,452.43 = 43,524.34 : x
  2. Step 2: Convert to fraction form
    85,678.90/128,452.43 = 43,524.34/x
  3. Step 3: Cross multiply
    85,678.90x = 128,452.43 × 43,524.34
  4. Step 4: Simplify right side
    85,678.90x = 5,590,807,237.15
  5. Step 5: Solve for x
    x = 5,590,807,237.15/85,678.90
  6. Step 6: Final answer
    x = 65,253.02

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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.