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Finding the Fourth Proportional to 715.77, 1,079.40 and 706.05

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Solution

The fourth proportional to 715.77, 1,079.40 and 706.05 is: 1,064.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.77 : 1,079.40 = 706.05 : x
  2. Step 2: Convert to fraction form
    715.77/1,079.40 = 706.05/x
  3. Step 3: Cross multiply
    715.77x = 1,079.40 × 706.05
  4. Step 4: Simplify right side
    715.77x = 762,110.37
  5. Step 5: Solve for x
    x = 762,110.37/715.77
  6. Step 6: Final answer
    x = 1,064.74

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.