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Finding the Fourth Proportional to 648.64, 895.22 and 386.66

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Solution

The fourth proportional to 648.64, 895.22 and 386.66 is: 533.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.64 : 895.22 = 386.66 : x
  2. Step 2: Convert to fraction form
    648.64/895.22 = 386.66/x
  3. Step 3: Cross multiply
    648.64x = 895.22 × 386.66
  4. Step 4: Simplify right side
    648.64x = 346,145.77
  5. Step 5: Solve for x
    x = 346,145.77/648.64
  6. Step 6: Final answer
    x = 533.65

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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.