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Finding the Fourth Proportional to 477.90, 715.43 and 445.10

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Solution

The fourth proportional to 477.90, 715.43 and 445.10 is: 666.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    477.90 : 715.43 = 445.10 : x
  2. Step 2: Convert to fraction form
    477.90/715.43 = 445.10/x
  3. Step 3: Cross multiply
    477.90x = 715.43 × 445.10
  4. Step 4: Simplify right side
    477.90x = 318,435.43
  5. Step 5: Solve for x
    x = 318,435.43/477.90
  6. Step 6: Final answer
    x = 666.32

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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.