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Finding the Fourth Proportional to 680.61, 1,020.51 and 310.35

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Solution

The fourth proportional to 680.61, 1,020.51 and 310.35 is: 465.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.61 : 1,020.51 = 310.35 : x
  2. Step 2: Convert to fraction form
    680.61/1,020.51 = 310.35/x
  3. Step 3: Cross multiply
    680.61x = 1,020.51 × 310.35
  4. Step 4: Simplify right side
    680.61x = 316,715.28
  5. Step 5: Solve for x
    x = 316,715.28/680.61
  6. Step 6: Final answer
    x = 465.34

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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.