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Finding the Fourth Proportional to 1,979.71, 2,970.36 and 747.47

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Solution

The fourth proportional to 1,979.71, 2,970.36 and 747.47 is: 1,121.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.71 : 2,970.36 = 747.47 : x
  2. Step 2: Convert to fraction form
    1,979.71/2,970.36 = 747.47/x
  3. Step 3: Cross multiply
    1,979.71x = 2,970.36 × 747.47
  4. Step 4: Simplify right side
    1,979.71x = 2,220,237.33
  5. Step 5: Solve for x
    x = 2,220,237.33/1,979.71
  6. Step 6: Final answer
    x = 1,121.50

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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.