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Finding the Fourth Proportional to 1,118.54, 1,543.34 and 621.07

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Solution

The fourth proportional to 1,118.54, 1,543.34 and 621.07 is: 856.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.54 : 1,543.34 = 621.07 : x
  2. Step 2: Convert to fraction form
    1,118.54/1,543.34 = 621.07/x
  3. Step 3: Cross multiply
    1,118.54x = 1,543.34 × 621.07
  4. Step 4: Simplify right side
    1,118.54x = 958,519.87
  5. Step 5: Solve for x
    x = 958,519.87/1,118.54
  6. Step 6: Final answer
    x = 856.94

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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.