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Finding the Fourth Proportional to 1,319.29, 1,978.12 and 625.02

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Solution

The fourth proportional to 1,319.29, 1,978.12 and 625.02 is: 937.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.29 : 1,978.12 = 625.02 : x
  2. Step 2: Convert to fraction form
    1,319.29/1,978.12 = 625.02/x
  3. Step 3: Cross multiply
    1,319.29x = 1,978.12 × 625.02
  4. Step 4: Simplify right side
    1,319.29x = 1,236,357.93
  5. Step 5: Solve for x
    x = 1,236,357.93/1,319.29
  6. Step 6: Final answer
    x = 937.14

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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.