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Finding the Fourth Proportional to 1,040.99, 1,561.94 and 553.47

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Solution

The fourth proportional to 1,040.99, 1,561.94 and 553.47 is: 830.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.99 : 1,561.94 = 553.47 : x
  2. Step 2: Convert to fraction form
    1,040.99/1,561.94 = 553.47/x
  3. Step 3: Cross multiply
    1,040.99x = 1,561.94 × 553.47
  4. Step 4: Simplify right side
    1,040.99x = 864,486.93
  5. Step 5: Solve for x
    x = 864,486.93/1,040.99
  6. Step 6: Final answer
    x = 830.45

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Double scale
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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.