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Finding the Fourth Proportional to 647.48, 969.58 and 509.80

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Solution

The fourth proportional to 647.48, 969.58 and 509.80 is: 763.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.48 : 969.58 = 509.80 : x
  2. Step 2: Convert to fraction form
    647.48/969.58 = 509.80/x
  3. Step 3: Cross multiply
    647.48x = 969.58 × 509.80
  4. Step 4: Simplify right side
    647.48x = 494,291.88
  5. Step 5: Solve for x
    x = 494,291.88/647.48
  6. Step 6: Final answer
    x = 763.41

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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.