Home / 21,050.40-31,575.60-11,815.20

Finding the Fourth Proportional to 21,050.40, 31,575.60 and 11,815.20

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Solution

The fourth proportional to 21,050.40, 31,575.60 and 11,815.20 is: 17,722.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,050.40 : 31,575.60 = 11,815.20 : x
  2. Step 2: Convert to fraction form
    21,050.40/31,575.60 = 11,815.20/x
  3. Step 3: Cross multiply
    21,050.40x = 31,575.60 × 11,815.20
  4. Step 4: Simplify right side
    21,050.40x = 373,072,029.12
  5. Step 5: Solve for x
    x = 373,072,029.12/21,050.40
  6. Step 6: Final answer
    x = 17,722.80

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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.