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Finding the Fourth Proportional to 357.08, 492.30 and 315.68

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Solution

The fourth proportional to 357.08, 492.30 and 315.68 is: 435.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.08 : 492.30 = 315.68 : x
  2. Step 2: Convert to fraction form
    357.08/492.30 = 315.68/x
  3. Step 3: Cross multiply
    357.08x = 492.30 × 315.68
  4. Step 4: Simplify right side
    357.08x = 155,409.26
  5. Step 5: Solve for x
    x = 155,409.26/357.08
  6. Step 6: Final answer
    x = 435.22

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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.