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Finding the Fourth Proportional to 85,716.76, 128,525.88 and 45,686.44

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Solution

The fourth proportional to 85,716.76, 128,525.88 and 45,686.44 is: 68,503.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,716.76 : 128,525.88 = 45,686.44 : x
  2. Step 2: Convert to fraction form
    85,716.76/128,525.88 = 45,686.44/x
  3. Step 3: Cross multiply
    85,716.76x = 128,525.88 × 45,686.44
  4. Step 4: Simplify right side
    85,716.76x = 5,871,889,905.07
  5. Step 5: Solve for x
    x = 5,871,889,905.07/85,716.76
  6. Step 6: Final answer
    x = 68,503.40

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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.