Home / 20,987.86-31,466.37-9,888.29

Finding the Fourth Proportional to 20,987.86, 31,466.37 and 9,888.29

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Solution

The fourth proportional to 20,987.86, 31,466.37 and 9,888.29 is: 14,825.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.86 : 31,466.37 = 9,888.29 : x
  2. Step 2: Convert to fraction form
    20,987.86/31,466.37 = 9,888.29/x
  3. Step 3: Cross multiply
    20,987.86x = 31,466.37 × 9,888.29
  4. Step 4: Simplify right side
    20,987.86x = 311,148,591.81
  5. Step 5: Solve for x
    x = 311,148,591.81/20,987.86
  6. Step 6: Final answer
    x = 14,825.17

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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.