Home / 85,521.12-128,301.12-38,787.36

Finding the Fourth Proportional to 85,521.12, 128,301.12 and 38,787.36

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Solution

The fourth proportional to 85,521.12, 128,301.12 and 38,787.36 is: 58,189.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,521.12 : 128,301.12 = 38,787.36 : x
  2. Step 2: Convert to fraction form
    85,521.12/128,301.12 = 38,787.36/x
  3. Step 3: Cross multiply
    85,521.12x = 128,301.12 × 38,787.36
  4. Step 4: Simplify right side
    85,521.12x = 4,976,461,729.84
  5. Step 5: Solve for x
    x = 4,976,461,729.84/85,521.12
  6. Step 6: Final answer
    x = 58,189.86

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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.