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Finding the Fourth Proportional to 18,779.78, 25,920.21 and 12,407.42

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Solution

The fourth proportional to 18,779.78, 25,920.21 and 12,407.42 is: 17,124.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,779.78 : 25,920.21 = 12,407.42 : x
  2. Step 2: Convert to fraction form
    18,779.78/25,920.21 = 12,407.42/x
  3. Step 3: Cross multiply
    18,779.78x = 25,920.21 × 12,407.42
  4. Step 4: Simplify right side
    18,779.78x = 321,602,931.96
  5. Step 5: Solve for x
    x = 321,602,931.96/18,779.78
  6. Step 6: Final answer
    x = 17,124.96

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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.