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Finding the Fourth Proportional to 11,355.64, 15,670.90 and 6,639

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Solution

The fourth proportional to 11,355.64, 15,670.90 and 6,639 is: 9,161.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,355.64 : 15,670.90 = 6,639 : x
  2. Step 2: Convert to fraction form
    11,355.64/15,670.90 = 6,639/x
  3. Step 3: Cross multiply
    11,355.64x = 15,670.90 × 6,639
  4. Step 4: Simplify right side
    11,355.64x = 104,039,105.10
  5. Step 5: Solve for x
    x = 104,039,105.10/11,355.64
  6. Step 6: Final answer
    x = 9,161.89

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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.