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Finding the Fourth Proportional to 85,447.51, 128,170.86 and 47,478.89

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Solution

The fourth proportional to 85,447.51, 128,170.86 and 47,478.89 is: 71,218.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,447.51 : 128,170.86 = 47,478.89 : x
  2. Step 2: Convert to fraction form
    85,447.51/128,170.86 = 47,478.89/x
  3. Step 3: Cross multiply
    85,447.51x = 128,170.86 × 47,478.89
  4. Step 4: Simplify right side
    85,447.51x = 6,085,410,305.53
  5. Step 5: Solve for x
    x = 6,085,410,305.53/85,447.51
  6. Step 6: Final answer
    x = 71,218.11

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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.