Home / 20,535.90-28,339.62-12,985.53

Finding the Fourth Proportional to 20,535.90, 28,339.62 and 12,985.53

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Solution

The fourth proportional to 20,535.90, 28,339.62 and 12,985.53 is: 17,920.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,535.90 : 28,339.62 = 12,985.53 : x
  2. Step 2: Convert to fraction form
    20,535.90/28,339.62 = 12,985.53/x
  3. Step 3: Cross multiply
    20,535.90x = 28,339.62 × 12,985.53
  4. Step 4: Simplify right side
    20,535.90x = 368,004,985.70
  5. Step 5: Solve for x
    x = 368,004,985.70/20,535.90
  6. Step 6: Final answer
    x = 17,920.08

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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.