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Finding the Fourth Proportional to 85,611.40, 128,378.70 and 38,840.20

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Solution

The fourth proportional to 85,611.40, 128,378.70 and 38,840.20 is: 58,242.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,611.40 : 128,378.70 = 38,840.20 : x
  2. Step 2: Convert to fraction form
    85,611.40/128,378.70 = 38,840.20/x
  3. Step 3: Cross multiply
    85,611.40x = 128,378.70 × 38,840.20
  4. Step 4: Simplify right side
    85,611.40x = 4,986,254,383.74
  5. Step 5: Solve for x
    x = 4,986,254,383.74/85,611.40
  6. Step 6: Final answer
    x = 58,242.88

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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.