Home / 15,285.20-21,135.20-13,316.90

Finding the Fourth Proportional to 15,285.20, 21,135.20 and 13,316.90

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Solution

The fourth proportional to 15,285.20, 21,135.20 and 13,316.90 is: 18,413.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,285.20 : 21,135.20 = 13,316.90 : x
  2. Step 2: Convert to fraction form
    15,285.20/21,135.20 = 13,316.90/x
  3. Step 3: Cross multiply
    15,285.20x = 21,135.20 × 13,316.90
  4. Step 4: Simplify right side
    15,285.20x = 281,455,172.62
  5. Step 5: Solve for x
    x = 281,455,172.62/15,285.20
  6. Step 6: Final answer
    x = 18,413.58

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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.