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Finding the Fourth Proportional to 1,319.30, 1,978.27 and 703.34

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Solution

The fourth proportional to 1,319.30, 1,978.27 and 703.34 is: 1,054.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.30 : 1,978.27 = 703.34 : x
  2. Step 2: Convert to fraction form
    1,319.30/1,978.27 = 703.34/x
  3. Step 3: Cross multiply
    1,319.30x = 1,978.27 × 703.34
  4. Step 4: Simplify right side
    1,319.30x = 1,391,384.77
  5. Step 5: Solve for x
    x = 1,391,384.77/1,319.30
  6. Step 6: Final answer
    x = 1,054.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.