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Finding the Fourth Proportional to 1,328.76, 1,993.14 and 558.72

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Solution

The fourth proportional to 1,328.76, 1,993.14 and 558.72 is: 838.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.76 : 1,993.14 = 558.72 : x
  2. Step 2: Convert to fraction form
    1,328.76/1,993.14 = 558.72/x
  3. Step 3: Cross multiply
    1,328.76x = 1,993.14 × 558.72
  4. Step 4: Simplify right side
    1,328.76x = 1,113,607.18
  5. Step 5: Solve for x
    x = 1,113,607.18/1,328.76
  6. Step 6: Final answer
    x = 838.08

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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.