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Finding the Fourth Proportional to 1,263.59, 1,742.55 and 890.88

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Solution

The fourth proportional to 1,263.59, 1,742.55 and 890.88 is: 1,228.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.59 : 1,742.55 = 890.88 : x
  2. Step 2: Convert to fraction form
    1,263.59/1,742.55 = 890.88/x
  3. Step 3: Cross multiply
    1,263.59x = 1,742.55 × 890.88
  4. Step 4: Simplify right side
    1,263.59x = 1,552,402.94
  5. Step 5: Solve for x
    x = 1,552,402.94/1,263.59
  6. Step 6: Final answer
    x = 1,228.57

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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.