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Finding the Fourth Proportional to 7,756.40, 11,615.40 and 6,220.40

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Solution

The fourth proportional to 7,756.40, 11,615.40 and 6,220.40 is: 9,315.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,756.40 : 11,615.40 = 6,220.40 : x
  2. Step 2: Convert to fraction form
    7,756.40/11,615.40 = 6,220.40/x
  3. Step 3: Cross multiply
    7,756.40x = 11,615.40 × 6,220.40
  4. Step 4: Simplify right side
    7,756.40x = 72,252,434.16
  5. Step 5: Solve for x
    x = 72,252,434.16/7,756.40
  6. Step 6: Final answer
    x = 9,315.20

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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.