Home / 18,985.34-28,461.80-13,421.18

Finding the Fourth Proportional to 18,985.34, 28,461.80 and 13,421.18

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Solution

The fourth proportional to 18,985.34, 28,461.80 and 13,421.18 is: 20,120.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985.34 : 28,461.80 = 13,421.18 : x
  2. Step 2: Convert to fraction form
    18,985.34/28,461.80 = 13,421.18/x
  3. Step 3: Cross multiply
    18,985.34x = 28,461.80 × 13,421.18
  4. Step 4: Simplify right side
    18,985.34x = 381,990,940.92
  5. Step 5: Solve for x
    x = 381,990,940.92/18,985.34
  6. Step 6: Final answer
    x = 20,120.31

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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.