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Finding the Fourth Proportional to 916.62, 1,374.21 and 429.42

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Solution

The fourth proportional to 916.62, 1,374.21 and 429.42 is: 643.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.62 : 1,374.21 = 429.42 : x
  2. Step 2: Convert to fraction form
    916.62/1,374.21 = 429.42/x
  3. Step 3: Cross multiply
    916.62x = 1,374.21 × 429.42
  4. Step 4: Simplify right side
    916.62x = 590,113.26
  5. Step 5: Solve for x
    x = 590,113.26/916.62
  6. Step 6: Final answer
    x = 643.79

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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.