Home / 21,009.60-31,514.40-12,140.10

Finding the Fourth Proportional to 21,009.60, 31,514.40 and 12,140.10

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Solution

The fourth proportional to 21,009.60, 31,514.40 and 12,140.10 is: 18,210.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.60 : 31,514.40 = 12,140.10 : x
  2. Step 2: Convert to fraction form
    21,009.60/31,514.40 = 12,140.10/x
  3. Step 3: Cross multiply
    21,009.60x = 31,514.40 × 12,140.10
  4. Step 4: Simplify right side
    21,009.60x = 382,587,967.44
  5. Step 5: Solve for x
    x = 382,587,967.44/21,009.60
  6. Step 6: Final answer
    x = 18,210.15

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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.