Home / 20,781.40-31,153.56-9,085.36

Finding the Fourth Proportional to 20,781.40, 31,153.56 and 9,085.36

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Solution

The fourth proportional to 20,781.40, 31,153.56 and 9,085.36 is: 13,619.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.40 : 31,153.56 = 9,085.36 : x
  2. Step 2: Convert to fraction form
    20,781.40/31,153.56 = 9,085.36/x
  3. Step 3: Cross multiply
    20,781.40x = 31,153.56 × 9,085.36
  4. Step 4: Simplify right side
    20,781.40x = 283,041,307.88
  5. Step 5: Solve for x
    x = 283,041,307.88/20,781.40
  6. Step 6: Final answer
    x = 13,619.93

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1.5x scale

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.