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Finding the Fourth Proportional to 31,315.85, 46,978.95 and 15,521.62

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Solution

The fourth proportional to 31,315.85, 46,978.95 and 15,521.62 is: 23,284.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,315.85 : 46,978.95 = 15,521.62 : x
  2. Step 2: Convert to fraction form
    31,315.85/46,978.95 = 15,521.62/x
  3. Step 3: Cross multiply
    31,315.85x = 46,978.95 × 15,521.62
  4. Step 4: Simplify right side
    31,315.85x = 729,189,409.90
  5. Step 5: Solve for x
    x = 729,189,409.90/31,315.85
  6. Step 6: Final answer
    x = 23,284.99

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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.