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Finding the Fourth Proportional to 918.55, 1,375.80 and 898.30

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Solution

The fourth proportional to 918.55, 1,375.80 and 898.30 is: 1,345.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.55 : 1,375.80 = 898.30 : x
  2. Step 2: Convert to fraction form
    918.55/1,375.80 = 898.30/x
  3. Step 3: Cross multiply
    918.55x = 1,375.80 × 898.30
  4. Step 4: Simplify right side
    918.55x = 1,235,881.14
  5. Step 5: Solve for x
    x = 1,235,881.14/918.55
  6. Step 6: Final answer
    x = 1,345.47

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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.