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Finding the Fourth Proportional to 85,720.80, 128,587.14 and 26,548.68

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Solution

The fourth proportional to 85,720.80, 128,587.14 and 26,548.68 is: 39,824.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,720.80 : 128,587.14 = 26,548.68 : x
  2. Step 2: Convert to fraction form
    85,720.80/128,587.14 = 26,548.68/x
  3. Step 3: Cross multiply
    85,720.80x = 128,587.14 × 26,548.68
  4. Step 4: Simplify right side
    85,720.80x = 3,413,818,831.98
  5. Step 5: Solve for x
    x = 3,413,818,831.98/85,720.80
  6. Step 6: Final answer
    x = 39,824.86

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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.