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Finding the Fourth Proportional to 916.08, 1,374.24 and 429.24

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Solution

The fourth proportional to 916.08, 1,374.24 and 429.24 is: 643.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.08 : 1,374.24 = 429.24 : x
  2. Step 2: Convert to fraction form
    916.08/1,374.24 = 429.24/x
  3. Step 3: Cross multiply
    916.08x = 1,374.24 × 429.24
  4. Step 4: Simplify right side
    916.08x = 589,878.78
  5. Step 5: Solve for x
    x = 589,878.78/916.08
  6. Step 6: Final answer
    x = 643.92

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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.