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Finding the Fourth Proportional to 20,703.60, 28,554.12 and 12,312

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Solution

The fourth proportional to 20,703.60, 28,554.12 and 12,312 is: 16,980.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,703.60 : 28,554.12 = 12,312 : x
  2. Step 2: Convert to fraction form
    20,703.60/28,554.12 = 12,312/x
  3. Step 3: Cross multiply
    20,703.60x = 28,554.12 × 12,312
  4. Step 4: Simplify right side
    20,703.60x = 351,558,325.44
  5. Step 5: Solve for x
    x = 351,558,325.44/20,703.60
  6. Step 6: Final answer
    x = 16,980.54

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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.