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Finding the Fourth Proportional to 20,993.19, 28,973.34 and 12,038.94

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Solution

The fourth proportional to 20,993.19, 28,973.34 and 12,038.94 is: 16,615.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.19 : 28,973.34 = 12,038.94 : x
  2. Step 2: Convert to fraction form
    20,993.19/28,973.34 = 12,038.94/x
  3. Step 3: Cross multiply
    20,993.19x = 28,973.34 × 12,038.94
  4. Step 4: Simplify right side
    20,993.19x = 348,808,301.86
  5. Step 5: Solve for x
    x = 348,808,301.86/20,993.19
  6. Step 6: Final answer
    x = 16,615.31

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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.