Home / 19,987.60-29,981.40-12,211.60

Finding the Fourth Proportional to 19,987.60, 29,981.40 and 12,211.60

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Solution

The fourth proportional to 19,987.60, 29,981.40 and 12,211.60 is: 18,317.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,987.60 : 29,981.40 = 12,211.60 : x
  2. Step 2: Convert to fraction form
    19,987.60/29,981.40 = 12,211.60/x
  3. Step 3: Cross multiply
    19,987.60x = 29,981.40 × 12,211.60
  4. Step 4: Simplify right side
    19,987.60x = 366,120,864.24
  5. Step 5: Solve for x
    x = 366,120,864.24/19,987.60
  6. Step 6: Final answer
    x = 18,317.40

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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.