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Finding the Fourth Proportional to 818.33, 1,128.51 and 631.52

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Solution

The fourth proportional to 818.33, 1,128.51 and 631.52 is: 870.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.33 : 1,128.51 = 631.52 : x
  2. Step 2: Convert to fraction form
    818.33/1,128.51 = 631.52/x
  3. Step 3: Cross multiply
    818.33x = 1,128.51 × 631.52
  4. Step 4: Simplify right side
    818.33x = 712,670.99
  5. Step 5: Solve for x
    x = 712,670.99/818.33
  6. Step 6: Final answer
    x = 870.89

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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.