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Finding the Fourth Proportional to 145.63, 218.55 and 84.70

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Solution

The fourth proportional to 145.63, 218.55 and 84.70 is: 127.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.63 : 218.55 = 84.70 : x
  2. Step 2: Convert to fraction form
    145.63/218.55 = 84.70/x
  3. Step 3: Cross multiply
    145.63x = 218.55 × 84.70
  4. Step 4: Simplify right side
    145.63x = 18,511.19
  5. Step 5: Solve for x
    x = 18,511.19/145.63
  6. Step 6: Final answer
    x = 127.11

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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.