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Finding the Fourth Proportional to 1,319.15, 1,980.09 and 972.87

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Solution

The fourth proportional to 1,319.15, 1,980.09 and 972.87 is: 1,460.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.15 : 1,980.09 = 972.87 : x
  2. Step 2: Convert to fraction form
    1,319.15/1,980.09 = 972.87/x
  3. Step 3: Cross multiply
    1,319.15x = 1,980.09 × 972.87
  4. Step 4: Simplify right side
    1,319.15x = 1,926,370.16
  5. Step 5: Solve for x
    x = 1,926,370.16/1,319.15
  6. Step 6: Final answer
    x = 1,460.31

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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.