Home / 13,139.16-18,125.28-8,890.40

Finding the Fourth Proportional to 13,139.16, 18,125.28 and 8,890.40

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Solution

The fourth proportional to 13,139.16, 18,125.28 and 8,890.40 is: 12,264.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,139.16 : 18,125.28 = 8,890.40 : x
  2. Step 2: Convert to fraction form
    13,139.16/18,125.28 = 8,890.40/x
  3. Step 3: Cross multiply
    13,139.16x = 18,125.28 × 8,890.40
  4. Step 4: Simplify right side
    13,139.16x = 161,140,989.31
  5. Step 5: Solve for x
    x = 161,140,989.31/13,139.16
  6. Step 6: Final answer
    x = 12,264.18

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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.