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Finding the Fourth Proportional to 1,055.23, 1,455.98 and 612.90

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Solution

The fourth proportional to 1,055.23, 1,455.98 and 612.90 is: 845.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.23 : 1,455.98 = 612.90 : x
  2. Step 2: Convert to fraction form
    1,055.23/1,455.98 = 612.90/x
  3. Step 3: Cross multiply
    1,055.23x = 1,455.98 × 612.90
  4. Step 4: Simplify right side
    1,055.23x = 892,371.67
  5. Step 5: Solve for x
    x = 892,371.67/1,055.23
  6. Step 6: Final answer
    x = 845.67

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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.