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Finding the Fourth Proportional to 1,152.74, 1,590.81 and 628.77

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Solution

The fourth proportional to 1,152.74, 1,590.81 and 628.77 is: 867.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.74 : 1,590.81 = 628.77 : x
  2. Step 2: Convert to fraction form
    1,152.74/1,590.81 = 628.77/x
  3. Step 3: Cross multiply
    1,152.74x = 1,590.81 × 628.77
  4. Step 4: Simplify right side
    1,152.74x = 1,000,257.21
  5. Step 5: Solve for x
    x = 1,000,257.21/1,152.74
  6. Step 6: Final answer
    x = 867.72

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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.