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Finding the Fourth Proportional to 18,985.93, 28,474.71 and 13,423.39

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Solution

The fourth proportional to 18,985.93, 28,474.71 and 13,423.39 is: 20,132.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985.93 : 28,474.71 = 13,423.39 : x
  2. Step 2: Convert to fraction form
    18,985.93/28,474.71 = 13,423.39/x
  3. Step 3: Cross multiply
    18,985.93x = 28,474.71 × 13,423.39
  4. Step 4: Simplify right side
    18,985.93x = 382,227,137.47
  5. Step 5: Solve for x
    x = 382,227,137.47/18,985.93
  6. Step 6: Final answer
    x = 20,132.13

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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.