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Finding the Fourth Proportional to 21,026.40, 31,510.80 and 17,138.40

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Solution

The fourth proportional to 21,026.40, 31,510.80 and 17,138.40 is: 25,684.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,026.40 : 31,510.80 = 17,138.40 : x
  2. Step 2: Convert to fraction form
    21,026.40/31,510.80 = 17,138.40/x
  3. Step 3: Cross multiply
    21,026.40x = 31,510.80 × 17,138.40
  4. Step 4: Simplify right side
    21,026.40x = 540,044,694.72
  5. Step 5: Solve for x
    x = 540,044,694.72/21,026.40
  6. Step 6: Final answer
    x = 25,684.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.