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Finding the Fourth Proportional to 986.64, 1,479.60 and 438.72

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Solution

The fourth proportional to 986.64, 1,479.60 and 438.72 is: 657.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.64 : 1,479.60 = 438.72 : x
  2. Step 2: Convert to fraction form
    986.64/1,479.60 = 438.72/x
  3. Step 3: Cross multiply
    986.64x = 1,479.60 × 438.72
  4. Step 4: Simplify right side
    986.64x = 649,130.11
  5. Step 5: Solve for x
    x = 649,130.11/986.64
  6. Step 6: Final answer
    x = 657.92

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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.