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Finding the Fourth Proportional to 948.16, 1,420.60 and 427.32

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Solution

The fourth proportional to 948.16, 1,420.60 and 427.32 is: 640.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.16 : 1,420.60 = 427.32 : x
  2. Step 2: Convert to fraction form
    948.16/1,420.60 = 427.32/x
  3. Step 3: Cross multiply
    948.16x = 1,420.60 × 427.32
  4. Step 4: Simplify right side
    948.16x = 607,050.79
  5. Step 5: Solve for x
    x = 607,050.79/948.16
  6. Step 6: Final answer
    x = 640.24

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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.