Home / 20,878.29-28,795.31-18,355.05

Finding the Fourth Proportional to 20,878.29, 28,795.31 and 18,355.05

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Solution

The fourth proportional to 20,878.29, 28,795.31 and 18,355.05 is: 25,315.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.29 : 28,795.31 = 18,355.05 : x
  2. Step 2: Convert to fraction form
    20,878.29/28,795.31 = 18,355.05/x
  3. Step 3: Cross multiply
    20,878.29x = 28,795.31 × 18,355.05
  4. Step 4: Simplify right side
    20,878.29x = 528,539,263.04
  5. Step 5: Solve for x
    x = 528,539,263.04/20,878.29
  6. Step 6: Final answer
    x = 25,315.26

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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.