Home / 9,285.70-12,815.40-5,305.90

Finding the Fourth Proportional to 9,285.70, 12,815.40 and 5,305.90

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Solution

The fourth proportional to 9,285.70, 12,815.40 and 5,305.90 is: 7,322.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,285.70 : 12,815.40 = 5,305.90 : x
  2. Step 2: Convert to fraction form
    9,285.70/12,815.40 = 5,305.90/x
  3. Step 3: Cross multiply
    9,285.70x = 12,815.40 × 5,305.90
  4. Step 4: Simplify right side
    9,285.70x = 67,997,230.86
  5. Step 5: Solve for x
    x = 67,997,230.86/9,285.70
  6. Step 6: Final answer
    x = 7,322.79

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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.