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Finding the Fourth Proportional to 64.88, 89.60 and 57.58

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Solution

The fourth proportional to 64.88, 89.60 and 57.58 is: 79.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.88 : 89.60 = 57.58 : x
  2. Step 2: Convert to fraction form
    64.88/89.60 = 57.58/x
  3. Step 3: Cross multiply
    64.88x = 89.60 × 57.58
  4. Step 4: Simplify right side
    64.88x = 5,159.17
  5. Step 5: Solve for x
    x = 5,159.17/64.88
  6. Step 6: Final answer
    x = 79.52

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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.