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Finding the Fourth Proportional to 21,000.03, 28,978.85 and 12,046.70

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Solution

The fourth proportional to 21,000.03, 28,978.85 and 12,046.70 is: 16,623.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.03 : 28,978.85 = 12,046.70 : x
  2. Step 2: Convert to fraction form
    21,000.03/28,978.85 = 12,046.70/x
  3. Step 3: Cross multiply
    21,000.03x = 28,978.85 × 12,046.70
  4. Step 4: Simplify right side
    21,000.03x = 349,099,307.17
  5. Step 5: Solve for x
    x = 349,099,307.17/21,000.03
  6. Step 6: Final answer
    x = 16,623.75

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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.