Home / 20,870.19-28,802.43-11,920.32

Finding the Fourth Proportional to 20,870.19, 28,802.43 and 11,920.32

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Solution

The fourth proportional to 20,870.19, 28,802.43 and 11,920.32 is: 16,450.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.19 : 28,802.43 = 11,920.32 : x
  2. Step 2: Convert to fraction form
    20,870.19/28,802.43 = 11,920.32/x
  3. Step 3: Cross multiply
    20,870.19x = 28,802.43 × 11,920.32
  4. Step 4: Simplify right side
    20,870.19x = 343,334,182.38
  5. Step 5: Solve for x
    x = 343,334,182.38/20,870.19
  6. Step 6: Final answer
    x = 16,450.94

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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.