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Finding the Fourth Proportional to 985.45, 1,478.93 and 437.98

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Solution

The fourth proportional to 985.45, 1,478.93 and 437.98 is: 657.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.45 : 1,478.93 = 437.98 : x
  2. Step 2: Convert to fraction form
    985.45/1,478.93 = 437.98/x
  3. Step 3: Cross multiply
    985.45x = 1,478.93 × 437.98
  4. Step 4: Simplify right side
    985.45x = 647,741.76
  5. Step 5: Solve for x
    x = 647,741.76/985.45
  6. Step 6: Final answer
    x = 657.31

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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.