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Finding the Fourth Proportional to 972.92, 1,343.94 and 777.80

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Solution

The fourth proportional to 972.92, 1,343.94 and 777.80 is: 1,074.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.92 : 1,343.94 = 777.80 : x
  2. Step 2: Convert to fraction form
    972.92/1,343.94 = 777.80/x
  3. Step 3: Cross multiply
    972.92x = 1,343.94 × 777.80
  4. Step 4: Simplify right side
    972.92x = 1,045,316.53
  5. Step 5: Solve for x
    x = 1,045,316.53/972.92
  6. Step 6: Final answer
    x = 1,074.41

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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.