Home / 7,123.80-9,829.98-4,140.12

Finding the Fourth Proportional to 7,123.80, 9,829.98 and 4,140.12

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Solution

The fourth proportional to 7,123.80, 9,829.98 and 4,140.12 is: 5,712.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,123.80 : 9,829.98 = 4,140.12 : x
  2. Step 2: Convert to fraction form
    7,123.80/9,829.98 = 4,140.12/x
  3. Step 3: Cross multiply
    7,123.80x = 9,829.98 × 4,140.12
  4. Step 4: Simplify right side
    7,123.80x = 40,697,296.80
  5. Step 5: Solve for x
    x = 40,697,296.80/7,123.80
  6. Step 6: Final answer
    x = 5,712.86

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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.