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Finding the Fourth Proportional to 1,316.25, 1,973.97 and 986.58

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Solution

The fourth proportional to 1,316.25, 1,973.97 and 986.58 is: 1,479.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.25 : 1,973.97 = 986.58 : x
  2. Step 2: Convert to fraction form
    1,316.25/1,973.97 = 986.58/x
  3. Step 3: Cross multiply
    1,316.25x = 1,973.97 × 986.58
  4. Step 4: Simplify right side
    1,316.25x = 1,947,479.32
  5. Step 5: Solve for x
    x = 1,947,479.32/1,316.25
  6. Step 6: Final answer
    x = 1,479.57

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1.5x scale

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.