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Finding the Fourth Proportional to 985.61, 1,478.55 and 369.13

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Solution

The fourth proportional to 985.61, 1,478.55 and 369.13 is: 553.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.61 : 1,478.55 = 369.13 : x
  2. Step 2: Convert to fraction form
    985.61/1,478.55 = 369.13/x
  3. Step 3: Cross multiply
    985.61x = 1,478.55 × 369.13
  4. Step 4: Simplify right side
    985.61x = 545,777.16
  5. Step 5: Solve for x
    x = 545,777.16/985.61
  6. Step 6: Final answer
    x = 553.75

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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.