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Finding the Fourth Proportional to 1,317.51, 1,978.31 and 1,259.08

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Solution

The fourth proportional to 1,317.51, 1,978.31 and 1,259.08 is: 1,890.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.51 : 1,978.31 = 1,259.08 : x
  2. Step 2: Convert to fraction form
    1,317.51/1,978.31 = 1,259.08/x
  3. Step 3: Cross multiply
    1,317.51x = 1,978.31 × 1,259.08
  4. Step 4: Simplify right side
    1,317.51x = 2,490,848.76
  5. Step 5: Solve for x
    x = 2,490,848.76/1,317.51
  6. Step 6: Final answer
    x = 1,890.57

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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.