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Finding the Fourth Proportional to 64.70, 96.68 and 56.47

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Solution

The fourth proportional to 64.70, 96.68 and 56.47 is: 84.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.70 : 96.68 = 56.47 : x
  2. Step 2: Convert to fraction form
    64.70/96.68 = 56.47/x
  3. Step 3: Cross multiply
    64.70x = 96.68 × 56.47
  4. Step 4: Simplify right side
    64.70x = 5,459.04
  5. Step 5: Solve for x
    x = 5,459.04/64.70
  6. Step 6: Final answer
    x = 84.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.