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Finding the Fourth Proportional to 916.70, 1,375.72 and 430.09

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Solution

The fourth proportional to 916.70, 1,375.72 and 430.09 is: 645.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.70 : 1,375.72 = 430.09 : x
  2. Step 2: Convert to fraction form
    916.70/1,375.72 = 430.09/x
  3. Step 3: Cross multiply
    916.70x = 1,375.72 × 430.09
  4. Step 4: Simplify right side
    916.70x = 591,678.90
  5. Step 5: Solve for x
    x = 591,678.90/916.70
  6. Step 6: Final answer
    x = 645.45

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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.