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Finding the Fourth Proportional to 998.65, 1,378.38 and 719.47

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Solution

The fourth proportional to 998.65, 1,378.38 and 719.47 is: 993.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.65 : 1,378.38 = 719.47 : x
  2. Step 2: Convert to fraction form
    998.65/1,378.38 = 719.47/x
  3. Step 3: Cross multiply
    998.65x = 1,378.38 × 719.47
  4. Step 4: Simplify right side
    998.65x = 991,703.06
  5. Step 5: Solve for x
    x = 991,703.06/998.65
  6. Step 6: Final answer
    x = 993.04

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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.