Home / 20,987.37-31,488.35-9,308.79

Finding the Fourth Proportional to 20,987.37, 31,488.35 and 9,308.79

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Solution

The fourth proportional to 20,987.37, 31,488.35 and 9,308.79 is: 13,966.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.37 : 31,488.35 = 9,308.79 : x
  2. Step 2: Convert to fraction form
    20,987.37/31,488.35 = 9,308.79/x
  3. Step 3: Cross multiply
    20,987.37x = 31,488.35 × 9,308.79
  4. Step 4: Simplify right side
    20,987.37x = 293,118,391.05
  5. Step 5: Solve for x
    x = 293,118,391.05/20,987.37
  6. Step 6: Final answer
    x = 13,966.42

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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.