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Finding the Fourth Proportional to 64.63, 89.21 and 53.70

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Solution

The fourth proportional to 64.63, 89.21 and 53.70 is: 74.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.63 : 89.21 = 53.70 : x
  2. Step 2: Convert to fraction form
    64.63/89.21 = 53.70/x
  3. Step 3: Cross multiply
    64.63x = 89.21 × 53.70
  4. Step 4: Simplify right side
    64.63x = 4,790.58
  5. Step 5: Solve for x
    x = 4,790.58/64.63
  6. Step 6: Final answer
    x = 74.12

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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.