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Finding the Fourth Proportional to 705.18, 1,055.73 and 661.53

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Solution

The fourth proportional to 705.18, 1,055.73 and 661.53 is: 990.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.18 : 1,055.73 = 661.53 : x
  2. Step 2: Convert to fraction form
    705.18/1,055.73 = 661.53/x
  3. Step 3: Cross multiply
    705.18x = 1,055.73 × 661.53
  4. Step 4: Simplify right side
    705.18x = 698,397.07
  5. Step 5: Solve for x
    x = 698,397.07/705.18
  6. Step 6: Final answer
    x = 990.38

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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.