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Finding the Fourth Proportional to 1,263.05, 1,742.80 and 703.50

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Solution

The fourth proportional to 1,263.05, 1,742.80 and 703.50 is: 970.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.05 : 1,742.80 = 703.50 : x
  2. Step 2: Convert to fraction form
    1,263.05/1,742.80 = 703.50/x
  3. Step 3: Cross multiply
    1,263.05x = 1,742.80 × 703.50
  4. Step 4: Simplify right side
    1,263.05x = 1,226,059.80
  5. Step 5: Solve for x
    x = 1,226,059.80/1,263.05
  6. Step 6: Final answer
    x = 970.71

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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.