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Finding the Fourth Proportional to 730.78, 1,008.60 and 469

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Solution

The fourth proportional to 730.78, 1,008.60 and 469 is: 647.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.78 : 1,008.60 = 469 : x
  2. Step 2: Convert to fraction form
    730.78/1,008.60 = 469/x
  3. Step 3: Cross multiply
    730.78x = 1,008.60 × 469
  4. Step 4: Simplify right side
    730.78x = 473,033.40
  5. Step 5: Solve for x
    x = 473,033.40/730.78
  6. Step 6: Final answer
    x = 647.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.