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Finding the Fourth Proportional to 12,657.20, 18,985.80 and 6,810.80

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Solution

The fourth proportional to 12,657.20, 18,985.80 and 6,810.80 is: 10,216.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,657.20 : 18,985.80 = 6,810.80 : x
  2. Step 2: Convert to fraction form
    12,657.20/18,985.80 = 6,810.80/x
  3. Step 3: Cross multiply
    12,657.20x = 18,985.80 × 6,810.80
  4. Step 4: Simplify right side
    12,657.20x = 129,308,486.64
  5. Step 5: Solve for x
    x = 129,308,486.64/12,657.20
  6. Step 6: Final answer
    x = 10,216.20

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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.