Home / 5,378.32-7,421.70-3,140.80

Finding the Fourth Proportional to 5,378.32, 7,421.70 and 3,140.80

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Solution

The fourth proportional to 5,378.32, 7,421.70 and 3,140.80 is: 4,334.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,378.32 : 7,421.70 = 3,140.80 : x
  2. Step 2: Convert to fraction form
    5,378.32/7,421.70 = 3,140.80/x
  3. Step 3: Cross multiply
    5,378.32x = 7,421.70 × 3,140.80
  4. Step 4: Simplify right side
    5,378.32x = 23,310,075.36
  5. Step 5: Solve for x
    x = 23,310,075.36/5,378.32
  6. Step 6: Final answer
    x = 4,334.08

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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.