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Finding the Fourth Proportional to 743.36, 1,115.20 and 526.40

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Solution

The fourth proportional to 743.36, 1,115.20 and 526.40 is: 789.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.36 : 1,115.20 = 526.40 : x
  2. Step 2: Convert to fraction form
    743.36/1,115.20 = 526.40/x
  3. Step 3: Cross multiply
    743.36x = 1,115.20 × 526.40
  4. Step 4: Simplify right side
    743.36x = 587,041.28
  5. Step 5: Solve for x
    x = 587,041.28/743.36
  6. Step 6: Final answer
    x = 789.71

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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.