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Finding the Fourth Proportional to 7,911.35, 10,915.20 and 5,259.21

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Solution

The fourth proportional to 7,911.35, 10,915.20 and 5,259.21 is: 7,256.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,911.35 : 10,915.20 = 5,259.21 : x
  2. Step 2: Convert to fraction form
    7,911.35/10,915.20 = 5,259.21/x
  3. Step 3: Cross multiply
    7,911.35x = 10,915.20 × 5,259.21
  4. Step 4: Simplify right side
    7,911.35x = 57,405,328.99
  5. Step 5: Solve for x
    x = 57,405,328.99/7,911.35
  6. Step 6: Final answer
    x = 7,256.07

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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.