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Finding the Fourth Proportional to 469.36, 646.24 and 399.28

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Solution

The fourth proportional to 469.36, 646.24 and 399.28 is: 549.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.36 : 646.24 = 399.28 : x
  2. Step 2: Convert to fraction form
    469.36/646.24 = 399.28/x
  3. Step 3: Cross multiply
    469.36x = 646.24 × 399.28
  4. Step 4: Simplify right side
    469.36x = 258,030.71
  5. Step 5: Solve for x
    x = 258,030.71/469.36
  6. Step 6: Final answer
    x = 549.75

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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.