Home / 7,911.75-10,918.40-5,122.11

Finding the Fourth Proportional to 7,911.75, 10,918.40 and 5,122.11

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Solution

The fourth proportional to 7,911.75, 10,918.40 and 5,122.11 is: 7,068.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,911.75 : 10,918.40 = 5,122.11 : x
  2. Step 2: Convert to fraction form
    7,911.75/10,918.40 = 5,122.11/x
  3. Step 3: Cross multiply
    7,911.75x = 10,918.40 × 5,122.11
  4. Step 4: Simplify right side
    7,911.75x = 55,925,220.21
  5. Step 5: Solve for x
    x = 55,925,220.21/7,911.75
  6. Step 6: Final answer
    x = 7,068.63

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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.