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Finding the Fourth Proportional to 753.72, 1,130.58 and 320.55

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Solution

The fourth proportional to 753.72, 1,130.58 and 320.55 is: 480.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.72 : 1,130.58 = 320.55 : x
  2. Step 2: Convert to fraction form
    753.72/1,130.58 = 320.55/x
  3. Step 3: Cross multiply
    753.72x = 1,130.58 × 320.55
  4. Step 4: Simplify right side
    753.72x = 362,407.42
  5. Step 5: Solve for x
    x = 362,407.42/753.72
  6. Step 6: Final answer
    x = 480.83

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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.