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Finding the Fourth Proportional to 21,003, 28,988.32 and 12,056.52

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Solution

The fourth proportional to 21,003, 28,988.32 and 12,056.52 is: 16,640.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,003 : 28,988.32 = 12,056.52 : x
  2. Step 2: Convert to fraction form
    21,003/28,988.32 = 12,056.52/x
  3. Step 3: Cross multiply
    21,003x = 28,988.32 × 12,056.52
  4. Step 4: Simplify right side
    21,003x = 349,498,259.85
  5. Step 5: Solve for x
    x = 349,498,259.85/21,003
  6. Step 6: Final answer
    x = 16,640.40

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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.