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Finding the Fourth Proportional to 56,761.48, 78,249 and 39,712.90

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Solution

The fourth proportional to 56,761.48, 78,249 and 39,712.90 is: 54,746.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,761.48 : 78,249 = 39,712.90 : x
  2. Step 2: Convert to fraction form
    56,761.48/78,249 = 39,712.90/x
  3. Step 3: Cross multiply
    56,761.48x = 78,249 × 39,712.90
  4. Step 4: Simplify right side
    56,761.48x = 3,107,494,712.10
  5. Step 5: Solve for x
    x = 3,107,494,712.10/56,761.48
  6. Step 6: Final answer
    x = 54,746.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.