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Finding the Fourth Proportional to 705.18, 1,055.32 and 580.28

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Solution

The fourth proportional to 705.18, 1,055.32 and 580.28 is: 868.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.18 : 1,055.32 = 580.28 : x
  2. Step 2: Convert to fraction form
    705.18/1,055.32 = 580.28/x
  3. Step 3: Cross multiply
    705.18x = 1,055.32 × 580.28
  4. Step 4: Simplify right side
    705.18x = 612,381.09
  5. Step 5: Solve for x
    x = 612,381.09/705.18
  6. Step 6: Final answer
    x = 868.40

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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.