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Finding the Fourth Proportional to 1,152.84, 1,590.88 and 628.88

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Solution

The fourth proportional to 1,152.84, 1,590.88 and 628.88 is: 867.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.84 : 1,590.88 = 628.88 : x
  2. Step 2: Convert to fraction form
    1,152.84/1,590.88 = 628.88/x
  3. Step 3: Cross multiply
    1,152.84x = 1,590.88 × 628.88
  4. Step 4: Simplify right side
    1,152.84x = 1,000,472.61
  5. Step 5: Solve for x
    x = 1,000,472.61/1,152.84
  6. Step 6: Final answer
    x = 867.83

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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.