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Finding the Fourth Proportional to 985.50, 1,478.40 and 369.29

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Solution

The fourth proportional to 985.50, 1,478.40 and 369.29 is: 554.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.50 : 1,478.40 = 369.29 : x
  2. Step 2: Convert to fraction form
    985.50/1,478.40 = 369.29/x
  3. Step 3: Cross multiply
    985.50x = 1,478.40 × 369.29
  4. Step 4: Simplify right side
    985.50x = 545,962.72
  5. Step 5: Solve for x
    x = 545,962.72/985.50
  6. Step 6: Final answer
    x = 554.00

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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.