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Finding the Fourth Proportional to 744.78, 1,026.60 and 587.15

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Solution

The fourth proportional to 744.78, 1,026.60 and 587.15 is: 809.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.78 : 1,026.60 = 587.15 : x
  2. Step 2: Convert to fraction form
    744.78/1,026.60 = 587.15/x
  3. Step 3: Cross multiply
    744.78x = 1,026.60 × 587.15
  4. Step 4: Simplify right side
    744.78x = 602,763.06
  5. Step 5: Solve for x
    x = 602,763.06/744.78
  6. Step 6: Final answer
    x = 809.32

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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.