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Finding the Fourth Proportional to 18,985.78, 28,466.52 and 9,124.84

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Solution

The fourth proportional to 18,985.78, 28,466.52 and 9,124.84 is: 13,681.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985.78 : 28,466.52 = 9,124.84 : x
  2. Step 2: Convert to fraction form
    18,985.78/28,466.52 = 9,124.84/x
  3. Step 3: Cross multiply
    18,985.78x = 28,466.52 × 9,124.84
  4. Step 4: Simplify right side
    18,985.78x = 259,752,440.36
  5. Step 5: Solve for x
    x = 259,752,440.36/18,985.78
  6. Step 6: Final answer
    x = 13,681.42

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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.