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Finding the Fourth Proportional to 1,275.56, 1,756.86 and 1,117.88

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Solution

The fourth proportional to 1,275.56, 1,756.86 and 1,117.88 is: 1,539.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.56 : 1,756.86 = 1,117.88 : x
  2. Step 2: Convert to fraction form
    1,275.56/1,756.86 = 1,117.88/x
  3. Step 3: Cross multiply
    1,275.56x = 1,756.86 × 1,117.88
  4. Step 4: Simplify right side
    1,275.56x = 1,963,958.66
  5. Step 5: Solve for x
    x = 1,963,958.66/1,275.56
  6. Step 6: Final answer
    x = 1,539.68

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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.