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Finding the Fourth Proportional to 971.08, 1,339.86 and 578.05

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Solution

The fourth proportional to 971.08, 1,339.86 and 578.05 is: 797.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.08 : 1,339.86 = 578.05 : x
  2. Step 2: Convert to fraction form
    971.08/1,339.86 = 578.05/x
  3. Step 3: Cross multiply
    971.08x = 1,339.86 × 578.05
  4. Step 4: Simplify right side
    971.08x = 774,506.07
  5. Step 5: Solve for x
    x = 774,506.07/971.08
  6. Step 6: Final answer
    x = 797.57

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Why These Related Problems?

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