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Finding the Fourth Proportional to 21,345.36, 29,457 and 12,393.60

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Solution

The fourth proportional to 21,345.36, 29,457 and 12,393.60 is: 17,103.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,345.36 : 29,457 = 12,393.60 : x
  2. Step 2: Convert to fraction form
    21,345.36/29,457 = 12,393.60/x
  3. Step 3: Cross multiply
    21,345.36x = 29,457 × 12,393.60
  4. Step 4: Simplify right side
    21,345.36x = 365,078,275.20
  5. Step 5: Solve for x
    x = 365,078,275.20/21,345.36
  6. Step 6: Final answer
    x = 17,103.40

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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.