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Finding the Fourth Proportional to 1,215.99, 1,678.23 and 718.92

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Solution

The fourth proportional to 1,215.99, 1,678.23 and 718.92 is: 992.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.99 : 1,678.23 = 718.92 : x
  2. Step 2: Convert to fraction form
    1,215.99/1,678.23 = 718.92/x
  3. Step 3: Cross multiply
    1,215.99x = 1,678.23 × 718.92
  4. Step 4: Simplify right side
    1,215.99x = 1,206,513.11
  5. Step 5: Solve for x
    x = 1,206,513.11/1,215.99
  6. Step 6: Final answer
    x = 992.21

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Double scale
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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.