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Finding the Fourth Proportional to 78.70, 117.51 and 70.04

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Solution

The fourth proportional to 78.70, 117.51 and 70.04 is: 104.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.70 : 117.51 = 70.04 : x
  2. Step 2: Convert to fraction form
    78.70/117.51 = 70.04/x
  3. Step 3: Cross multiply
    78.70x = 117.51 × 70.04
  4. Step 4: Simplify right side
    78.70x = 8,230.40
  5. Step 5: Solve for x
    x = 8,230.40/78.70
  6. Step 6: Final answer
    x = 104.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.