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Finding the Fourth Proportional to 918.06, 1,375.74 and 430.98

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Solution

The fourth proportional to 918.06, 1,375.74 and 430.98 is: 645.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.06 : 1,375.74 = 430.98 : x
  2. Step 2: Convert to fraction form
    918.06/1,375.74 = 430.98/x
  3. Step 3: Cross multiply
    918.06x = 1,375.74 × 430.98
  4. Step 4: Simplify right side
    918.06x = 592,916.43
  5. Step 5: Solve for x
    x = 592,916.43/918.06
  6. Step 6: Final answer
    x = 645.84

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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.