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Finding the Fourth Proportional to 305.02, 420.55 and 265.53

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Solution

The fourth proportional to 305.02, 420.55 and 265.53 is: 366.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.02 : 420.55 = 265.53 : x
  2. Step 2: Convert to fraction form
    305.02/420.55 = 265.53/x
  3. Step 3: Cross multiply
    305.02x = 420.55 × 265.53
  4. Step 4: Simplify right side
    305.02x = 111,668.64
  5. Step 5: Solve for x
    x = 111,668.64/305.02
  6. Step 6: Final answer
    x = 366.10

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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.