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Finding the Fourth Proportional to 21,005.00, 28,987.01 and 11,445.00

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Solution

The fourth proportional to 21,005.00, 28,987.01 and 11,445.00 is: 15,794.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.00 : 28,987.01 = 11,445.00 : x
  2. Step 2: Convert to fraction form
    21,005.00/28,987.01 = 11,445.00/x
  3. Step 3: Cross multiply
    21,005.00x = 28,987.01 × 11,445.00
  4. Step 4: Simplify right side
    21,005.00x = 331,756,270.82
  5. Step 5: Solve for x
    x = 331,756,270.82/21,005.00
  6. Step 6: Final answer
    x = 15,794.16

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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.