Home / 12,165.02-18,215.88-10,421.20

Finding the Fourth Proportional to 12,165.02, 18,215.88 and 10,421.20

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Solution

The fourth proportional to 12,165.02, 18,215.88 and 10,421.20 is: 15,604.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,165.02 : 18,215.88 = 10,421.20 : x
  2. Step 2: Convert to fraction form
    12,165.02/18,215.88 = 10,421.20/x
  3. Step 3: Cross multiply
    12,165.02x = 18,215.88 × 10,421.20
  4. Step 4: Simplify right side
    12,165.02x = 189,831,328.66
  5. Step 5: Solve for x
    x = 189,831,328.66/12,165.02
  6. Step 6: Final answer
    x = 15,604.69

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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.