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Finding the Fourth Proportional to 704.39, 1,055.36 and 678.87

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Solution

The fourth proportional to 704.39, 1,055.36 and 678.87 is: 1,017.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.39 : 1,055.36 = 678.87 : x
  2. Step 2: Convert to fraction form
    704.39/1,055.36 = 678.87/x
  3. Step 3: Cross multiply
    704.39x = 1,055.36 × 678.87
  4. Step 4: Simplify right side
    704.39x = 716,448.85
  5. Step 5: Solve for x
    x = 716,448.85/704.39
  6. Step 6: Final answer
    x = 1,017.13

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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.