Home / 3,970.95-5,479.80-2,178.40

Finding the Fourth Proportional to 3,970.95, 5,479.80 and 2,178.40

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Solution

The fourth proportional to 3,970.95, 5,479.80 and 2,178.40 is: 3,006.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,970.95 : 5,479.80 = 2,178.40 : x
  2. Step 2: Convert to fraction form
    3,970.95/5,479.80 = 2,178.40/x
  3. Step 3: Cross multiply
    3,970.95x = 5,479.80 × 2,178.40
  4. Step 4: Simplify right side
    3,970.95x = 11,937,196.32
  5. Step 5: Solve for x
    x = 11,937,196.32/3,970.95
  6. Step 6: Final answer
    x = 3,006.13

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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.