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Finding the Fourth Proportional to 916.79, 1,375.59 and 429.80

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Solution

The fourth proportional to 916.79, 1,375.59 and 429.80 is: 644.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.79 : 1,375.59 = 429.80 : x
  2. Step 2: Convert to fraction form
    916.79/1,375.59 = 429.80/x
  3. Step 3: Cross multiply
    916.79x = 1,375.59 × 429.80
  4. Step 4: Simplify right side
    916.79x = 591,228.58
  5. Step 5: Solve for x
    x = 591,228.58/916.79
  6. Step 6: Final answer
    x = 644.89

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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.