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Finding the Fourth Proportional to 85,871.04, 128,885.14 and 43,781.30

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Solution

The fourth proportional to 85,871.04, 128,885.14 and 43,781.30 is: 65,712.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,871.04 : 128,885.14 = 43,781.30 : x
  2. Step 2: Convert to fraction form
    85,871.04/128,885.14 = 43,781.30/x
  3. Step 3: Cross multiply
    85,871.04x = 128,885.14 × 43,781.30
  4. Step 4: Simplify right side
    85,871.04x = 5,642,758,979.88
  5. Step 5: Solve for x
    x = 5,642,758,979.88/85,871.04
  6. Step 6: Final answer
    x = 65,712.01

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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.