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Finding the Fourth Proportional to 985.53, 1,478.01 and 369.19

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Solution

The fourth proportional to 985.53, 1,478.01 and 369.19 is: 553.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.53 : 1,478.01 = 369.19 : x
  2. Step 2: Convert to fraction form
    985.53/1,478.01 = 369.19/x
  3. Step 3: Cross multiply
    985.53x = 1,478.01 × 369.19
  4. Step 4: Simplify right side
    985.53x = 545,666.51
  5. Step 5: Solve for x
    x = 545,666.51/985.53
  6. Step 6: Final answer
    x = 553.68

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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.