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Finding the Fourth Proportional to 916.83, 1,375.38 and 430.02

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Solution

The fourth proportional to 916.83, 1,375.38 and 430.02 is: 645.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.83 : 1,375.38 = 430.02 : x
  2. Step 2: Convert to fraction form
    916.83/1,375.38 = 430.02/x
  3. Step 3: Cross multiply
    916.83x = 1,375.38 × 430.02
  4. Step 4: Simplify right side
    916.83x = 591,440.91
  5. Step 5: Solve for x
    x = 591,440.91/916.83
  6. Step 6: Final answer
    x = 645.09

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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.