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Finding the Fourth Proportional to 1,117.77, 1,675.57 and 386.79

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Solution

The fourth proportional to 1,117.77, 1,675.57 and 386.79 is: 579.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.77 : 1,675.57 = 386.79 : x
  2. Step 2: Convert to fraction form
    1,117.77/1,675.57 = 386.79/x
  3. Step 3: Cross multiply
    1,117.77x = 1,675.57 × 386.79
  4. Step 4: Simplify right side
    1,117.77x = 648,093.72
  5. Step 5: Solve for x
    x = 648,093.72/1,117.77
  6. Step 6: Final answer
    x = 579.81

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.