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Finding the Fourth Proportional to 7,485.40, 11,211.90 and 6,513.40

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Solution

The fourth proportional to 7,485.40, 11,211.90 and 6,513.40 is: 9,756.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,485.40 : 11,211.90 = 6,513.40 : x
  2. Step 2: Convert to fraction form
    7,485.40/11,211.90 = 6,513.40/x
  3. Step 3: Cross multiply
    7,485.40x = 11,211.90 × 6,513.40
  4. Step 4: Simplify right side
    7,485.40x = 73,027,589.46
  5. Step 5: Solve for x
    x = 73,027,589.46/7,485.40
  6. Step 6: Final answer
    x = 9,756.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.