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Finding the Fourth Proportional to 85,813.92, 128,719.26 and 26,648.28

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Solution

The fourth proportional to 85,813.92, 128,719.26 and 26,648.28 is: 39,971.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,813.92 : 128,719.26 = 26,648.28 : x
  2. Step 2: Convert to fraction form
    85,813.92/128,719.26 = 26,648.28/x
  3. Step 3: Cross multiply
    85,813.92x = 128,719.26 × 26,648.28
  4. Step 4: Simplify right side
    85,813.92x = 3,430,146,881.87
  5. Step 5: Solve for x
    x = 3,430,146,881.87/85,813.92
  6. Step 6: Final answer
    x = 39,971.92

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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.