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Finding the Fourth Proportional to 1,216.13, 1,678.37 and 718.93

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Solution

The fourth proportional to 1,216.13, 1,678.37 and 718.93 is: 992.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.13 : 1,678.37 = 718.93 : x
  2. Step 2: Convert to fraction form
    1,216.13/1,678.37 = 718.93/x
  3. Step 3: Cross multiply
    1,216.13x = 1,678.37 × 718.93
  4. Step 4: Simplify right side
    1,216.13x = 1,206,630.54
  5. Step 5: Solve for x
    x = 1,206,630.54/1,216.13
  6. Step 6: Final answer
    x = 992.19

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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.