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Finding the Fourth Proportional to 816.45, 1,125.59 and 554.01

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Solution

The fourth proportional to 816.45, 1,125.59 and 554.01 is: 763.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.45 : 1,125.59 = 554.01 : x
  2. Step 2: Convert to fraction form
    816.45/1,125.59 = 554.01/x
  3. Step 3: Cross multiply
    816.45x = 1,125.59 × 554.01
  4. Step 4: Simplify right side
    816.45x = 623,582.49
  5. Step 5: Solve for x
    x = 623,582.49/816.45
  6. Step 6: Final answer
    x = 763.78

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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.