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Finding the Fourth Proportional to 469.94, 647.64 and 386.54

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Solution

The fourth proportional to 469.94, 647.64 and 386.54 is: 532.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.94 : 647.64 = 386.54 : x
  2. Step 2: Convert to fraction form
    469.94/647.64 = 386.54/x
  3. Step 3: Cross multiply
    469.94x = 647.64 × 386.54
  4. Step 4: Simplify right side
    469.94x = 250,338.77
  5. Step 5: Solve for x
    x = 250,338.77/469.94
  6. Step 6: Final answer
    x = 532.70

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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.