Home / 13,689.02-18,890.86-7,401.40

Finding the Fourth Proportional to 13,689.02, 18,890.86 and 7,401.40

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Solution

The fourth proportional to 13,689.02, 18,890.86 and 7,401.40 is: 10,213.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.02 : 18,890.86 = 7,401.40 : x
  2. Step 2: Convert to fraction form
    13,689.02/18,890.86 = 7,401.40/x
  3. Step 3: Cross multiply
    13,689.02x = 18,890.86 × 7,401.40
  4. Step 4: Simplify right side
    13,689.02x = 139,818,745.47
  5. Step 5: Solve for x
    x = 139,818,745.47/13,689.02
  6. Step 6: Final answer
    x = 10,213.93

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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.