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Finding the Fourth Proportional to 12,390.78, 17,099.28 and 7,085.55

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Solution

The fourth proportional to 12,390.78, 17,099.28 and 7,085.55 is: 9,778.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.78 : 17,099.28 = 7,085.55 : x
  2. Step 2: Convert to fraction form
    12,390.78/17,099.28 = 7,085.55/x
  3. Step 3: Cross multiply
    12,390.78x = 17,099.28 × 7,085.55
  4. Step 4: Simplify right side
    12,390.78x = 121,157,803.40
  5. Step 5: Solve for x
    x = 121,157,803.40/12,390.78
  6. Step 6: Final answer
    x = 9,778.06

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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.