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Finding the Fourth Proportional to 1,402.64, 1,935.63 and 781.64

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Solution

The fourth proportional to 1,402.64, 1,935.63 and 781.64 is: 1,078.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,402.64 : 1,935.63 = 781.64 : x
  2. Step 2: Convert to fraction form
    1,402.64/1,935.63 = 781.64/x
  3. Step 3: Cross multiply
    1,402.64x = 1,935.63 × 781.64
  4. Step 4: Simplify right side
    1,402.64x = 1,512,965.83
  5. Step 5: Solve for x
    x = 1,512,965.83/1,402.64
  6. Step 6: Final answer
    x = 1,078.66

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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.