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Finding the Fourth Proportional to 85,383.54, 128,064.38 and 47,920.23

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Solution

The fourth proportional to 85,383.54, 128,064.38 and 47,920.23 is: 71,874.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,383.54 : 128,064.38 = 47,920.23 : x
  2. Step 2: Convert to fraction form
    85,383.54/128,064.38 = 47,920.23/x
  3. Step 3: Cross multiply
    85,383.54x = 128,064.38 × 47,920.23
  4. Step 4: Simplify right side
    85,383.54x = 6,136,874,304.81
  5. Step 5: Solve for x
    x = 6,136,874,304.81/85,383.54
  6. Step 6: Final answer
    x = 71,874.21

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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.