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Finding the Fourth Proportional to 684.17, 1,021.46 and 619.60

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Solution

The fourth proportional to 684.17, 1,021.46 and 619.60 is: 925.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.17 : 1,021.46 = 619.60 : x
  2. Step 2: Convert to fraction form
    684.17/1,021.46 = 619.60/x
  3. Step 3: Cross multiply
    684.17x = 1,021.46 × 619.60
  4. Step 4: Simplify right side
    684.17x = 632,890.96
  5. Step 5: Solve for x
    x = 632,890.96/684.17
  6. Step 6: Final answer
    x = 925.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.