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Finding the Fourth Proportional to 106.90, 147.47 and 70.07

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Solution

The fourth proportional to 106.90, 147.47 and 70.07 is: 96.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.90 : 147.47 = 70.07 : x
  2. Step 2: Convert to fraction form
    106.90/147.47 = 70.07/x
  3. Step 3: Cross multiply
    106.90x = 147.47 × 70.07
  4. Step 4: Simplify right side
    106.90x = 10,332.14
  5. Step 5: Solve for x
    x = 10,332.14/106.90
  6. Step 6: Final answer
    x = 96.65

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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.