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Finding the Fourth Proportional to 428.55, 591.11 and 260.51

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Solution

The fourth proportional to 428.55, 591.11 and 260.51 is: 359.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.55 : 591.11 = 260.51 : x
  2. Step 2: Convert to fraction form
    428.55/591.11 = 260.51/x
  3. Step 3: Cross multiply
    428.55x = 591.11 × 260.51
  4. Step 4: Simplify right side
    428.55x = 153,985.81
  5. Step 5: Solve for x
    x = 153,985.81/428.55
  6. Step 6: Final answer
    x = 359.32

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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.