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Finding the Fourth Proportional to 904.78, 1,356.51 and 611.55

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Solution

The fourth proportional to 904.78, 1,356.51 and 611.55 is: 916.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.78 : 1,356.51 = 611.55 : x
  2. Step 2: Convert to fraction form
    904.78/1,356.51 = 611.55/x
  3. Step 3: Cross multiply
    904.78x = 1,356.51 × 611.55
  4. Step 4: Simplify right side
    904.78x = 829,575.98
  5. Step 5: Solve for x
    x = 829,575.98/904.78
  6. Step 6: Final answer
    x = 916.88

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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.