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Finding the Fourth Proportional to 85,378.45, 128,065.88 and 28,456.48

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Solution

The fourth proportional to 85,378.45, 128,065.88 and 28,456.48 is: 42,684.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,378.45 : 128,065.88 = 28,456.48 : x
  2. Step 2: Convert to fraction form
    85,378.45/128,065.88 = 28,456.48/x
  3. Step 3: Cross multiply
    85,378.45x = 128,065.88 × 28,456.48
  4. Step 4: Simplify right side
    85,378.45x = 3,644,303,512.57
  5. Step 5: Solve for x
    x = 3,644,303,512.57/85,378.45
  6. Step 6: Final answer
    x = 42,684.11

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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.