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Finding the Fourth Proportional to 645.08, 890.16 and 383.12

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Solution

The fourth proportional to 645.08, 890.16 and 383.12 is: 528.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.08 : 890.16 = 383.12 : x
  2. Step 2: Convert to fraction form
    645.08/890.16 = 383.12/x
  3. Step 3: Cross multiply
    645.08x = 890.16 × 383.12
  4. Step 4: Simplify right side
    645.08x = 341,038.10
  5. Step 5: Solve for x
    x = 341,038.10/645.08
  6. Step 6: Final answer
    x = 528.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.