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Finding the Fourth Proportional to 985.06, 1,476.81 and 436.84

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Solution

The fourth proportional to 985.06, 1,476.81 and 436.84 is: 654.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.06 : 1,476.81 = 436.84 : x
  2. Step 2: Convert to fraction form
    985.06/1,476.81 = 436.84/x
  3. Step 3: Cross multiply
    985.06x = 1,476.81 × 436.84
  4. Step 4: Simplify right side
    985.06x = 645,129.68
  5. Step 5: Solve for x
    x = 645,129.68/985.06
  6. Step 6: Final answer
    x = 654.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.