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Finding the Fourth Proportional to 916.84, 1,373.34 and 404.20

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Solution

The fourth proportional to 916.84, 1,373.34 and 404.20 is: 605.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.84 : 1,373.34 = 404.20 : x
  2. Step 2: Convert to fraction form
    916.84/1,373.34 = 404.20/x
  3. Step 3: Cross multiply
    916.84x = 1,373.34 × 404.20
  4. Step 4: Simplify right side
    916.84x = 555,104.03
  5. Step 5: Solve for x
    x = 555,104.03/916.84
  6. Step 6: Final answer
    x = 605.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.