Home / 8,721.80-12,038.10-5,186.60

Finding the Fourth Proportional to 8,721.80, 12,038.10 and 5,186.60

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Solution

The fourth proportional to 8,721.80, 12,038.10 and 5,186.60 is: 7,158.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,721.80 : 12,038.10 = 5,186.60 : x
  2. Step 2: Convert to fraction form
    8,721.80/12,038.10 = 5,186.60/x
  3. Step 3: Cross multiply
    8,721.80x = 12,038.10 × 5,186.60
  4. Step 4: Simplify right side
    8,721.80x = 62,436,809.46
  5. Step 5: Solve for x
    x = 62,436,809.46/8,721.80
  6. Step 6: Final answer
    x = 7,158.71

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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.