Home / 20,870.02-28,803-11,918.80

Finding the Fourth Proportional to 20,870.02, 28,803 and 11,918.80

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Solution

The fourth proportional to 20,870.02, 28,803 and 11,918.80 is: 16,449.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.02 : 28,803 = 11,918.80 : x
  2. Step 2: Convert to fraction form
    20,870.02/28,803 = 11,918.80/x
  3. Step 3: Cross multiply
    20,870.02x = 28,803 × 11,918.80
  4. Step 4: Simplify right side
    20,870.02x = 343,297,196.40
  5. Step 5: Solve for x
    x = 343,297,196.40/20,870.02
  6. Step 6: Final answer
    x = 16,449.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.