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Finding the Fourth Proportional to 1,579.63, 2,178.95 and 989.14

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Solution

The fourth proportional to 1,579.63, 2,178.95 and 989.14 is: 1,364.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,579.63 : 2,178.95 = 989.14 : x
  2. Step 2: Convert to fraction form
    1,579.63/2,178.95 = 989.14/x
  3. Step 3: Cross multiply
    1,579.63x = 2,178.95 × 989.14
  4. Step 4: Simplify right side
    1,579.63x = 2,155,276.21
  5. Step 5: Solve for x
    x = 2,155,276.21/1,579.63
  6. Step 6: Final answer
    x = 1,364.42

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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.