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Finding the Fourth Proportional to 85,474.40, 128,210.40 and 38,727.20

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Solution

The fourth proportional to 85,474.40, 128,210.40 and 38,727.20 is: 58,090.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,474.40 : 128,210.40 = 38,727.20 : x
  2. Step 2: Convert to fraction form
    85,474.40/128,210.40 = 38,727.20/x
  3. Step 3: Cross multiply
    85,474.40x = 128,210.40 × 38,727.20
  4. Step 4: Simplify right side
    85,474.40x = 4,965,229,802.88
  5. Step 5: Solve for x
    x = 4,965,229,802.88/85,474.40
  6. Step 6: Final answer
    x = 58,090.26

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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.