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Finding the Fourth Proportional to 1,152.72, 1,590.75 and 628.75

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Solution

The fourth proportional to 1,152.72, 1,590.75 and 628.75 is: 867.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.72 : 1,590.75 = 628.75 : x
  2. Step 2: Convert to fraction form
    1,152.72/1,590.75 = 628.75/x
  3. Step 3: Cross multiply
    1,152.72x = 1,590.75 × 628.75
  4. Step 4: Simplify right side
    1,152.72x = 1,000,184.06
  5. Step 5: Solve for x
    x = 1,000,184.06/1,152.72
  6. Step 6: Final answer
    x = 867.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.