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Finding the Fourth Proportional to 21,598.68, 29,795.98 and 12,640.64

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Solution

The fourth proportional to 21,598.68, 29,795.98 and 12,640.64 is: 17,438.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,598.68 : 29,795.98 = 12,640.64 : x
  2. Step 2: Convert to fraction form
    21,598.68/29,795.98 = 12,640.64/x
  3. Step 3: Cross multiply
    21,598.68x = 29,795.98 × 12,640.64
  4. Step 4: Simplify right side
    21,598.68x = 376,640,256.63
  5. Step 5: Solve for x
    x = 376,640,256.63/21,598.68
  6. Step 6: Final answer
    x = 17,438.11

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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.