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Finding the Fourth Proportional to 1,117.92, 1,542.62 and 620.58

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Solution

The fourth proportional to 1,117.92, 1,542.62 and 620.58 is: 856.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.92 : 1,542.62 = 620.58 : x
  2. Step 2: Convert to fraction form
    1,117.92/1,542.62 = 620.58/x
  3. Step 3: Cross multiply
    1,117.92x = 1,542.62 × 620.58
  4. Step 4: Simplify right side
    1,117.92x = 957,316.02
  5. Step 5: Solve for x
    x = 957,316.02/1,117.92
  6. Step 6: Final answer
    x = 856.34

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1.5x scale

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.