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Finding the Fourth Proportional to 1,117.66, 1,542.39 and 620.32

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Solution

The fourth proportional to 1,117.66, 1,542.39 and 620.32 is: 856.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.66 : 1,542.39 = 620.32 : x
  2. Step 2: Convert to fraction form
    1,117.66/1,542.39 = 620.32/x
  3. Step 3: Cross multiply
    1,117.66x = 1,542.39 × 620.32
  4. Step 4: Simplify right side
    1,117.66x = 956,775.36
  5. Step 5: Solve for x
    x = 956,775.36/1,117.66
  6. Step 6: Final answer
    x = 856.05

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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.