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Finding the Fourth Proportional to 904.78, 1,355.10 and 658.72

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Solution

The fourth proportional to 904.78, 1,355.10 and 658.72 is: 986.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.78 : 1,355.10 = 658.72 : x
  2. Step 2: Convert to fraction form
    904.78/1,355.10 = 658.72/x
  3. Step 3: Cross multiply
    904.78x = 1,355.10 × 658.72
  4. Step 4: Simplify right side
    904.78x = 892,631.47
  5. Step 5: Solve for x
    x = 892,631.47/904.78
  6. Step 6: Final answer
    x = 986.57

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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.