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Finding the Fourth Proportional to 817.89, 1,128.75 and 468.63

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Solution

The fourth proportional to 817.89, 1,128.75 and 468.63 is: 646.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.89 : 1,128.75 = 468.63 : x
  2. Step 2: Convert to fraction form
    817.89/1,128.75 = 468.63/x
  3. Step 3: Cross multiply
    817.89x = 1,128.75 × 468.63
  4. Step 4: Simplify right side
    817.89x = 528,966.11
  5. Step 5: Solve for x
    x = 528,966.11/817.89
  6. Step 6: Final answer
    x = 646.74

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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.