Home / 28,690.85-39,582.29-21,155.02

Finding the Fourth Proportional to 28,690.85, 39,582.29 and 21,155.02

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Solution

The fourth proportional to 28,690.85, 39,582.29 and 21,155.02 is: 29,185.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,690.85 : 39,582.29 = 21,155.02 : x
  2. Step 2: Convert to fraction form
    28,690.85/39,582.29 = 21,155.02/x
  3. Step 3: Cross multiply
    28,690.85x = 39,582.29 × 21,155.02
  4. Step 4: Simplify right side
    28,690.85x = 837,363,832.91
  5. Step 5: Solve for x
    x = 837,363,832.91/28,690.85
  6. Step 6: Final answer
    x = 29,185.75

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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.