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Finding the Fourth Proportional to 12,658.60, 18,987.90 and 10,779.40

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Solution

The fourth proportional to 12,658.60, 18,987.90 and 10,779.40 is: 16,169.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,658.60 : 18,987.90 = 10,779.40 : x
  2. Step 2: Convert to fraction form
    12,658.60/18,987.90 = 10,779.40/x
  3. Step 3: Cross multiply
    12,658.60x = 18,987.90 × 10,779.40
  4. Step 4: Simplify right side
    12,658.60x = 204,678,169.26
  5. Step 5: Solve for x
    x = 204,678,169.26/12,658.60
  6. Step 6: Final answer
    x = 16,169.10

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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.