Home / 21,210.40-31,815.60-5,629.60

Finding the Fourth Proportional to 21,210.40, 31,815.60 and 5,629.60

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Solution

The fourth proportional to 21,210.40, 31,815.60 and 5,629.60 is: 8,444.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,210.40 : 31,815.60 = 5,629.60 : x
  2. Step 2: Convert to fraction form
    21,210.40/31,815.60 = 5,629.60/x
  3. Step 3: Cross multiply
    21,210.40x = 31,815.60 × 5,629.60
  4. Step 4: Simplify right side
    21,210.40x = 179,109,101.76
  5. Step 5: Solve for x
    x = 179,109,101.76/21,210.40
  6. Step 6: Final answer
    x = 8,444.40

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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.