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Finding the Fourth Proportional to 985.38, 1,478.65 and 547

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Solution

The fourth proportional to 985.38, 1,478.65 and 547 is: 820.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.38 : 1,478.65 = 547 : x
  2. Step 2: Convert to fraction form
    985.38/1,478.65 = 547/x
  3. Step 3: Cross multiply
    985.38x = 1,478.65 × 547
  4. Step 4: Simplify right side
    985.38x = 808,818.82
  5. Step 5: Solve for x
    x = 808,818.82/985.38
  6. Step 6: Final answer
    x = 820.82

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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.