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Finding the Fourth Proportional to 948.24, 1,420.74 and 912.24

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Solution

The fourth proportional to 948.24, 1,420.74 and 912.24 is: 1,366.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.24 : 1,420.74 = 912.24 : x
  2. Step 2: Convert to fraction form
    948.24/1,420.74 = 912.24/x
  3. Step 3: Cross multiply
    948.24x = 1,420.74 × 912.24
  4. Step 4: Simplify right side
    948.24x = 1,296,055.86
  5. Step 5: Solve for x
    x = 1,296,055.86/948.24
  6. Step 6: Final answer
    x = 1,366.80

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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.