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Finding the Fourth Proportional to 28,988.70, 43,405.10 and 18,401.40

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Solution

The fourth proportional to 28,988.70, 43,405.10 and 18,401.40 is: 27,552.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,988.70 : 43,405.10 = 18,401.40 : x
  2. Step 2: Convert to fraction form
    28,988.70/43,405.10 = 18,401.40/x
  3. Step 3: Cross multiply
    28,988.70x = 43,405.10 × 18,401.40
  4. Step 4: Simplify right side
    28,988.70x = 798,714,669.65
  5. Step 5: Solve for x
    x = 798,714,669.65/28,988.70
  6. Step 6: Final answer
    x = 27,552.63

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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.