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Finding the Fourth Proportional to 1,166.40, 1,609.60 and 642.40

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Solution

The fourth proportional to 1,166.40, 1,609.60 and 642.40 is: 886.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,166.40 : 1,609.60 = 642.40 : x
  2. Step 2: Convert to fraction form
    1,166.40/1,609.60 = 642.40/x
  3. Step 3: Cross multiply
    1,166.40x = 1,609.60 × 642.40
  4. Step 4: Simplify right side
    1,166.40x = 1,034,007.04
  5. Step 5: Solve for x
    x = 1,034,007.04/1,166.40
  6. Step 6: Final answer
    x = 886.49

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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.