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Finding the Fourth Proportional to 655.84, 904.96 and 390.29

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Solution

The fourth proportional to 655.84, 904.96 and 390.29 is: 538.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.84 : 904.96 = 390.29 : x
  2. Step 2: Convert to fraction form
    655.84/904.96 = 390.29/x
  3. Step 3: Cross multiply
    655.84x = 904.96 × 390.29
  4. Step 4: Simplify right side
    655.84x = 353,196.84
  5. Step 5: Solve for x
    x = 353,196.84/655.84
  6. Step 6: Final answer
    x = 538.54

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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.