Home / 13,085.12-18,057.60-7,780.40

Finding the Fourth Proportional to 13,085.12, 18,057.60 and 7,780.40

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Solution

The fourth proportional to 13,085.12, 18,057.60 and 7,780.40 is: 10,737.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,085.12 : 18,057.60 = 7,780.40 : x
  2. Step 2: Convert to fraction form
    13,085.12/18,057.60 = 7,780.40/x
  3. Step 3: Cross multiply
    13,085.12x = 18,057.60 × 7,780.40
  4. Step 4: Simplify right side
    13,085.12x = 140,495,351.04
  5. Step 5: Solve for x
    x = 140,495,351.04/13,085.12
  6. Step 6: Final answer
    x = 10,737.03

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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.