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Finding the Fourth Proportional to 1,986.79, 2,979.73 and 891.47

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Solution

The fourth proportional to 1,986.79, 2,979.73 and 891.47 is: 1,337.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.79 : 2,979.73 = 891.47 : x
  2. Step 2: Convert to fraction form
    1,986.79/2,979.73 = 891.47/x
  3. Step 3: Cross multiply
    1,986.79x = 2,979.73 × 891.47
  4. Step 4: Simplify right side
    1,986.79x = 2,656,337.29
  5. Step 5: Solve for x
    x = 2,656,337.29/1,986.79
  6. Step 6: Final answer
    x = 1,337.00

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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.