Home / 20,830.60-28,746.12-11,399.32

Finding the Fourth Proportional to 20,830.60, 28,746.12 and 11,399.32

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Solution

The fourth proportional to 20,830.60, 28,746.12 and 11,399.32 is: 15,731.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.60 : 28,746.12 = 11,399.32 : x
  2. Step 2: Convert to fraction form
    20,830.60/28,746.12 = 11,399.32/x
  3. Step 3: Cross multiply
    20,830.60x = 28,746.12 × 11,399.32
  4. Step 4: Simplify right side
    20,830.60x = 327,686,220.64
  5. Step 5: Solve for x
    x = 327,686,220.64/20,830.60
  6. Step 6: Final answer
    x = 15,731.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.