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Finding the Fourth Proportional to 755.13, 1,130.64 and 389.15

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Solution

The fourth proportional to 755.13, 1,130.64 and 389.15 is: 582.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.13 : 1,130.64 = 389.15 : x
  2. Step 2: Convert to fraction form
    755.13/1,130.64 = 389.15/x
  3. Step 3: Cross multiply
    755.13x = 1,130.64 × 389.15
  4. Step 4: Simplify right side
    755.13x = 439,988.56
  5. Step 5: Solve for x
    x = 439,988.56/755.13
  6. Step 6: Final answer
    x = 582.67

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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.