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Finding the Fourth Proportional to 18,987.52, 28,495.68 and 8,606.40

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Solution

The fourth proportional to 18,987.52, 28,495.68 and 8,606.40 is: 12,916.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.52 : 28,495.68 = 8,606.40 : x
  2. Step 2: Convert to fraction form
    18,987.52/28,495.68 = 8,606.40/x
  3. Step 3: Cross multiply
    18,987.52x = 28,495.68 × 8,606.40
  4. Step 4: Simplify right side
    18,987.52x = 245,245,220.35
  5. Step 5: Solve for x
    x = 245,245,220.35/18,987.52
  6. Step 6: Final answer
    x = 12,916.13

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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.