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Finding the Fourth Proportional to 755.04, 1,130.40 and 511.20

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Solution

The fourth proportional to 755.04, 1,130.40 and 511.20 is: 765.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.04 : 1,130.40 = 511.20 : x
  2. Step 2: Convert to fraction form
    755.04/1,130.40 = 511.20/x
  3. Step 3: Cross multiply
    755.04x = 1,130.40 × 511.20
  4. Step 4: Simplify right side
    755.04x = 577,860.48
  5. Step 5: Solve for x
    x = 577,860.48/755.04
  6. Step 6: Final answer
    x = 765.34

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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.