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Finding the Fourth Proportional to 985.79, 1,478.37 and 438.46

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Solution

The fourth proportional to 985.79, 1,478.37 and 438.46 is: 657.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.79 : 1,478.37 = 438.46 : x
  2. Step 2: Convert to fraction form
    985.79/1,478.37 = 438.46/x
  3. Step 3: Cross multiply
    985.79x = 1,478.37 × 438.46
  4. Step 4: Simplify right side
    985.79x = 648,206.11
  5. Step 5: Solve for x
    x = 648,206.11/985.79
  6. Step 6: Final answer
    x = 657.55

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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.