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Finding the Fourth Proportional to 879.86, 1,210.74 and 718.91

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Solution

The fourth proportional to 879.86, 1,210.74 and 718.91 is: 989.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.86 : 1,210.74 = 718.91 : x
  2. Step 2: Convert to fraction form
    879.86/1,210.74 = 718.91/x
  3. Step 3: Cross multiply
    879.86x = 1,210.74 × 718.91
  4. Step 4: Simplify right side
    879.86x = 870,408.88
  5. Step 5: Solve for x
    x = 870,408.88/879.86
  6. Step 6: Final answer
    x = 989.26

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.