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Finding the Fourth Proportional to 85,813.70, 128,730.15 and 26,648.90

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Solution

The fourth proportional to 85,813.70, 128,730.15 and 26,648.90 is: 39,976.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,813.70 : 128,730.15 = 26,648.90 : x
  2. Step 2: Convert to fraction form
    85,813.70/128,730.15 = 26,648.90/x
  3. Step 3: Cross multiply
    85,813.70x = 128,730.15 × 26,648.90
  4. Step 4: Simplify right side
    85,813.70x = 3,430,516,894.34
  5. Step 5: Solve for x
    x = 3,430,516,894.34/85,813.70
  6. Step 6: Final answer
    x = 39,976.33

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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.