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Finding the Fourth Proportional to 985.09, 1,359.36 and 542.99

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Solution

The fourth proportional to 985.09, 1,359.36 and 542.99 is: 749.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.09 : 1,359.36 = 542.99 : x
  2. Step 2: Convert to fraction form
    985.09/1,359.36 = 542.99/x
  3. Step 3: Cross multiply
    985.09x = 1,359.36 × 542.99
  4. Step 4: Simplify right side
    985.09x = 738,121.61
  5. Step 5: Solve for x
    x = 738,121.61/985.09
  6. Step 6: Final answer
    x = 749.30

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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.