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Finding the Fourth Proportional to 918.15, 1,377.28 and 260.08

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Solution

The fourth proportional to 918.15, 1,377.28 and 260.08 is: 390.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.15 : 1,377.28 = 260.08 : x
  2. Step 2: Convert to fraction form
    918.15/1,377.28 = 260.08/x
  3. Step 3: Cross multiply
    918.15x = 1,377.28 × 260.08
  4. Step 4: Simplify right side
    918.15x = 358,202.98
  5. Step 5: Solve for x
    x = 358,202.98/918.15
  6. Step 6: Final answer
    x = 390.14

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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.