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Finding the Fourth Proportional to 18,698.55, 28,040.53 and 7,005.39

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Solution

The fourth proportional to 18,698.55, 28,040.53 and 7,005.39 is: 10,505.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,698.55 : 28,040.53 = 7,005.39 : x
  2. Step 2: Convert to fraction form
    18,698.55/28,040.53 = 7,005.39/x
  3. Step 3: Cross multiply
    18,698.55x = 28,040.53 × 7,005.39
  4. Step 4: Simplify right side
    18,698.55x = 196,434,690.74
  5. Step 5: Solve for x
    x = 196,434,690.74/18,698.55
  6. Step 6: Final answer
    x = 10,505.35

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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.