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Finding the Fourth Proportional to 918.44, 1,376.36 and 507.78

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Solution

The fourth proportional to 918.44, 1,376.36 and 507.78 is: 760.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.44 : 1,376.36 = 507.78 : x
  2. Step 2: Convert to fraction form
    918.44/1,376.36 = 507.78/x
  3. Step 3: Cross multiply
    918.44x = 1,376.36 × 507.78
  4. Step 4: Simplify right side
    918.44x = 698,888.08
  5. Step 5: Solve for x
    x = 698,888.08/918.44
  6. Step 6: Final answer
    x = 760.95

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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.