Home / 21,080.79-31,636.80-9,987.53

Finding the Fourth Proportional to 21,080.79, 31,636.80 and 9,987.53

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Solution

The fourth proportional to 21,080.79, 31,636.80 and 9,987.53 is: 14,988.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,080.79 : 31,636.80 = 9,987.53 : x
  2. Step 2: Convert to fraction form
    21,080.79/31,636.80 = 9,987.53/x
  3. Step 3: Cross multiply
    21,080.79x = 31,636.80 × 9,987.53
  4. Step 4: Simplify right side
    21,080.79x = 315,973,330.92
  5. Step 5: Solve for x
    x = 315,973,330.92/21,080.79
  6. Step 6: Final answer
    x = 14,988.69

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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.