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Finding the Fourth Proportional to 1,061.64, 1,471.77 and 995.40

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Solution

The fourth proportional to 1,061.64, 1,471.77 and 995.40 is: 1,379.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,061.64 : 1,471.77 = 995.40 : x
  2. Step 2: Convert to fraction form
    1,061.64/1,471.77 = 995.40/x
  3. Step 3: Cross multiply
    1,061.64x = 1,471.77 × 995.40
  4. Step 4: Simplify right side
    1,061.64x = 1,464,999.86
  5. Step 5: Solve for x
    x = 1,464,999.86/1,061.64
  6. Step 6: Final answer
    x = 1,379.94

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.