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Finding the Fourth Proportional to 682.50, 1,020.62 and 509.28

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Solution

The fourth proportional to 682.50, 1,020.62 and 509.28 is: 761.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.50 : 1,020.62 = 509.28 : x
  2. Step 2: Convert to fraction form
    682.50/1,020.62 = 509.28/x
  3. Step 3: Cross multiply
    682.50x = 1,020.62 × 509.28
  4. Step 4: Simplify right side
    682.50x = 519,781.35
  5. Step 5: Solve for x
    x = 519,781.35/682.50
  6. Step 6: Final answer
    x = 761.58

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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.