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Finding the Fourth Proportional to 755.93, 1,134.54 and 390.89

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Solution

The fourth proportional to 755.93, 1,134.54 and 390.89 is: 586.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.93 : 1,134.54 = 390.89 : x
  2. Step 2: Convert to fraction form
    755.93/1,134.54 = 390.89/x
  3. Step 3: Cross multiply
    755.93x = 1,134.54 × 390.89
  4. Step 4: Simplify right side
    755.93x = 443,483.18
  5. Step 5: Solve for x
    x = 443,483.18/755.93
  6. Step 6: Final answer
    x = 586.67

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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.