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Finding the Fourth Proportional to 20,855.71, 28,779.71 and 12,358.64

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Solution

The fourth proportional to 20,855.71, 28,779.71 and 12,358.64 is: 17,054.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.71 : 28,779.71 = 12,358.64 : x
  2. Step 2: Convert to fraction form
    20,855.71/28,779.71 = 12,358.64/x
  3. Step 3: Cross multiply
    20,855.71x = 28,779.71 × 12,358.64
  4. Step 4: Simplify right side
    20,855.71x = 355,678,085.35
  5. Step 5: Solve for x
    x = 355,678,085.35/20,855.71
  6. Step 6: Final answer
    x = 17,054.23

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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.