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Finding the Fourth Proportional to 1,018.93, 1,405.95 and 576.76

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Solution

The fourth proportional to 1,018.93, 1,405.95 and 576.76 is: 795.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.93 : 1,405.95 = 576.76 : x
  2. Step 2: Convert to fraction form
    1,018.93/1,405.95 = 576.76/x
  3. Step 3: Cross multiply
    1,018.93x = 1,405.95 × 576.76
  4. Step 4: Simplify right side
    1,018.93x = 810,895.72
  5. Step 5: Solve for x
    x = 810,895.72/1,018.93
  6. Step 6: Final answer
    x = 795.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.