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Finding the Fourth Proportional to 30,986.10, 46,479.15 and 18,520.20

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Solution

The fourth proportional to 30,986.10, 46,479.15 and 18,520.20 is: 27,780.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,986.10 : 46,479.15 = 18,520.20 : x
  2. Step 2: Convert to fraction form
    30,986.10/46,479.15 = 18,520.20/x
  3. Step 3: Cross multiply
    30,986.10x = 46,479.15 × 18,520.20
  4. Step 4: Simplify right side
    30,986.10x = 860,803,153.83
  5. Step 5: Solve for x
    x = 860,803,153.83/30,986.10
  6. Step 6: Final answer
    x = 27,780.30

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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.