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Finding the Fourth Proportional to 904.90, 1,356.72 and 417.28

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Solution

The fourth proportional to 904.90, 1,356.72 and 417.28 is: 625.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.90 : 1,356.72 = 417.28 : x
  2. Step 2: Convert to fraction form
    904.90/1,356.72 = 417.28/x
  3. Step 3: Cross multiply
    904.90x = 1,356.72 × 417.28
  4. Step 4: Simplify right side
    904.90x = 566,132.12
  5. Step 5: Solve for x
    x = 566,132.12/904.90
  6. Step 6: Final answer
    x = 625.63

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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.