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Finding the Fourth Proportional to 21,392.88, 29,509.80 and 12,889.20

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Solution

The fourth proportional to 21,392.88, 29,509.80 and 12,889.20 is: 17,779.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,392.88 : 29,509.80 = 12,889.20 : x
  2. Step 2: Convert to fraction form
    21,392.88/29,509.80 = 12,889.20/x
  3. Step 3: Cross multiply
    21,392.88x = 29,509.80 × 12,889.20
  4. Step 4: Simplify right side
    21,392.88x = 380,357,714.16
  5. Step 5: Solve for x
    x = 380,357,714.16/21,392.88
  6. Step 6: Final answer
    x = 17,779.64

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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.