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Finding the Fourth Proportional to 1,323.91, 1,987.47 and 838.99

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Solution

The fourth proportional to 1,323.91, 1,987.47 and 838.99 is: 1,259.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.91 : 1,987.47 = 838.99 : x
  2. Step 2: Convert to fraction form
    1,323.91/1,987.47 = 838.99/x
  3. Step 3: Cross multiply
    1,323.91x = 1,987.47 × 838.99
  4. Step 4: Simplify right side
    1,323.91x = 1,667,467.46
  5. Step 5: Solve for x
    x = 1,667,467.46/1,323.91
  6. Step 6: Final answer
    x = 1,259.50

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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.