Home / 20,870.10-28,800.75-11,310.08

Finding the Fourth Proportional to 20,870.10, 28,800.75 and 11,310.08

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Solution

The fourth proportional to 20,870.10, 28,800.75 and 11,310.08 is: 15,607.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.10 : 28,800.75 = 11,310.08 : x
  2. Step 2: Convert to fraction form
    20,870.10/28,800.75 = 11,310.08/x
  3. Step 3: Cross multiply
    20,870.10x = 28,800.75 × 11,310.08
  4. Step 4: Simplify right side
    20,870.10x = 325,738,621.35
  5. Step 5: Solve for x
    x = 325,738,621.35/20,870.10
  6. Step 6: Final answer
    x = 15,607.91

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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.