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Finding the Fourth Proportional to 904.86, 1,248.64 and 511.78

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Solution

The fourth proportional to 904.86, 1,248.64 and 511.78 is: 706.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.86 : 1,248.64 = 511.78 : x
  2. Step 2: Convert to fraction form
    904.86/1,248.64 = 511.78/x
  3. Step 3: Cross multiply
    904.86x = 1,248.64 × 511.78
  4. Step 4: Simplify right side
    904.86x = 639,028.98
  5. Step 5: Solve for x
    x = 639,028.98/904.86
  6. Step 6: Final answer
    x = 706.22

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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.