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Finding the Fourth Proportional to 916.88, 1,374.64 and 551.58

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Solution

The fourth proportional to 916.88, 1,374.64 and 551.58 is: 826.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.88 : 1,374.64 = 551.58 : x
  2. Step 2: Convert to fraction form
    916.88/1,374.64 = 551.58/x
  3. Step 3: Cross multiply
    916.88x = 1,374.64 × 551.58
  4. Step 4: Simplify right side
    916.88x = 758,225.99
  5. Step 5: Solve for x
    x = 758,225.99/916.88
  6. Step 6: Final answer
    x = 826.96

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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.