Home / 1,979.20-2,970.08-1,113.92

Finding the Fourth Proportional to 1,979.20, 2,970.08 and 1,113.92

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Solution

The fourth proportional to 1,979.20, 2,970.08 and 1,113.92 is: 1,671.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.20 : 2,970.08 = 1,113.92 : x
  2. Step 2: Convert to fraction form
    1,979.20/2,970.08 = 1,113.92/x
  3. Step 3: Cross multiply
    1,979.20x = 2,970.08 × 1,113.92
  4. Step 4: Simplify right side
    1,979.20x = 3,308,431.51
  5. Step 5: Solve for x
    x = 3,308,431.51/1,979.20
  6. Step 6: Final answer
    x = 1,671.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.