Home / 20,931.08-31,369.86-9,813.24

Finding the Fourth Proportional to 20,931.08, 31,369.86 and 9,813.24

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Solution

The fourth proportional to 20,931.08, 31,369.86 and 9,813.24 is: 14,707.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.08 : 31,369.86 = 9,813.24 : x
  2. Step 2: Convert to fraction form
    20,931.08/31,369.86 = 9,813.24/x
  3. Step 3: Cross multiply
    20,931.08x = 31,369.86 × 9,813.24
  4. Step 4: Simplify right side
    20,931.08x = 307,839,964.95
  5. Step 5: Solve for x
    x = 307,839,964.95/20,931.08
  6. Step 6: Final answer
    x = 14,707.32

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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.