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Finding the Fourth Proportional to 64.63, 88.72 and 58.15

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Solution

The fourth proportional to 64.63, 88.72 and 58.15 is: 79.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.63 : 88.72 = 58.15 : x
  2. Step 2: Convert to fraction form
    64.63/88.72 = 58.15/x
  3. Step 3: Cross multiply
    64.63x = 88.72 × 58.15
  4. Step 4: Simplify right side
    64.63x = 5,159.07
  5. Step 5: Solve for x
    x = 5,159.07/64.63
  6. Step 6: Final answer
    x = 79.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.