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Finding the Fourth Proportional to 64.83, 89.40 and 54.99

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Solution

The fourth proportional to 64.83, 89.40 and 54.99 is: 75.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.83 : 89.40 = 54.99 : x
  2. Step 2: Convert to fraction form
    64.83/89.40 = 54.99/x
  3. Step 3: Cross multiply
    64.83x = 89.40 × 54.99
  4. Step 4: Simplify right side
    64.83x = 4,915.83
  5. Step 5: Solve for x
    x = 4,915.83/64.83
  6. Step 6: Final answer
    x = 75.83

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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.