Home / 20,690.63-31,036.02-5,108.25

Finding the Fourth Proportional to 20,690.63, 31,036.02 and 5,108.25

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Solution

The fourth proportional to 20,690.63, 31,036.02 and 5,108.25 is: 7,662.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.63 : 31,036.02 = 5,108.25 : x
  2. Step 2: Convert to fraction form
    20,690.63/31,036.02 = 5,108.25/x
  3. Step 3: Cross multiply
    20,690.63x = 31,036.02 × 5,108.25
  4. Step 4: Simplify right side
    20,690.63x = 158,539,749.17
  5. Step 5: Solve for x
    x = 158,539,749.17/20,690.63
  6. Step 6: Final answer
    x = 7,662.40

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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.