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Finding the Fourth Proportional to 85,188.48, 128,420.52 and 79,479.60

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Solution

The fourth proportional to 85,188.48, 128,420.52 and 79,479.60 is: 119,814.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,188.48 : 128,420.52 = 79,479.60 : x
  2. Step 2: Convert to fraction form
    85,188.48/128,420.52 = 79,479.60/x
  3. Step 3: Cross multiply
    85,188.48x = 128,420.52 × 79,479.60
  4. Step 4: Simplify right side
    85,188.48x = 10,206,811,561.39
  5. Step 5: Solve for x
    x = 10,206,811,561.39/85,188.48
  6. Step 6: Final answer
    x = 119,814.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.