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Finding the Fourth Proportional to 613, 918.64 and 553.08

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Solution

The fourth proportional to 613, 918.64 and 553.08 is: 828.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    613 : 918.64 = 553.08 : x
  2. Step 2: Convert to fraction form
    613/918.64 = 553.08/x
  3. Step 3: Cross multiply
    613x = 918.64 × 553.08
  4. Step 4: Simplify right side
    613x = 508,081.41
  5. Step 5: Solve for x
    x = 508,081.41/613
  6. Step 6: Final answer
    x = 828.84

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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.