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Finding the Fourth Proportional to 421.16, 581.67 and 288.99

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Solution

The fourth proportional to 421.16, 581.67 and 288.99 is: 399.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.16 : 581.67 = 288.99 : x
  2. Step 2: Convert to fraction form
    421.16/581.67 = 288.99/x
  3. Step 3: Cross multiply
    421.16x = 581.67 × 288.99
  4. Step 4: Simplify right side
    421.16x = 168,096.81
  5. Step 5: Solve for x
    x = 168,096.81/421.16
  6. Step 6: Final answer
    x = 399.13

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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.