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Finding the Fourth Proportional to 869.54, 1,199.98 and 491.45

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Solution

The fourth proportional to 869.54, 1,199.98 and 491.45 is: 678.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.54 : 1,199.98 = 491.45 : x
  2. Step 2: Convert to fraction form
    869.54/1,199.98 = 491.45/x
  3. Step 3: Cross multiply
    869.54x = 1,199.98 × 491.45
  4. Step 4: Simplify right side
    869.54x = 589,730.17
  5. Step 5: Solve for x
    x = 589,730.17/869.54
  6. Step 6: Final answer
    x = 678.21

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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.