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Finding the Fourth Proportional to 26,115.60, 39,108.60 and 20,931.60

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Solution

The fourth proportional to 26,115.60, 39,108.60 and 20,931.60 is: 31,345.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,115.60 : 39,108.60 = 20,931.60 : x
  2. Step 2: Convert to fraction form
    26,115.60/39,108.60 = 20,931.60/x
  3. Step 3: Cross multiply
    26,115.60x = 39,108.60 × 20,931.60
  4. Step 4: Simplify right side
    26,115.60x = 818,605,571.76
  5. Step 5: Solve for x
    x = 818,605,571.76/26,115.60
  6. Step 6: Final answer
    x = 31,345.46

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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.