Home / 20,870.12-28,804.47-15,825.84

Finding the Fourth Proportional to 20,870.12, 28,804.47 and 15,825.84

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Solution

The fourth proportional to 20,870.12, 28,804.47 and 15,825.84 is: 21,842.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.12 : 28,804.47 = 15,825.84 : x
  2. Step 2: Convert to fraction form
    20,870.12/28,804.47 = 15,825.84/x
  3. Step 3: Cross multiply
    20,870.12x = 28,804.47 × 15,825.84
  4. Step 4: Simplify right side
    20,870.12x = 455,854,891.66
  5. Step 5: Solve for x
    x = 455,854,891.66/20,870.12
  6. Step 6: Final answer
    x = 21,842.46

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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.