Home / 20,681.66-31,068.63-12,790.01

Finding the Fourth Proportional to 20,681.66, 31,068.63 and 12,790.01

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Solution

The fourth proportional to 20,681.66, 31,068.63 and 12,790.01 is: 19,213.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.66 : 31,068.63 = 12,790.01 : x
  2. Step 2: Convert to fraction form
    20,681.66/31,068.63 = 12,790.01/x
  3. Step 3: Cross multiply
    20,681.66x = 31,068.63 × 12,790.01
  4. Step 4: Simplify right side
    20,681.66x = 397,368,166.06
  5. Step 5: Solve for x
    x = 397,368,166.06/20,681.66
  6. Step 6: Final answer
    x = 19,213.55

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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.