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Finding the Fourth Proportional to 1,298.93, 1,947.33 and 518.60

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Solution

The fourth proportional to 1,298.93, 1,947.33 and 518.60 is: 777.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.93 : 1,947.33 = 518.60 : x
  2. Step 2: Convert to fraction form
    1,298.93/1,947.33 = 518.60/x
  3. Step 3: Cross multiply
    1,298.93x = 1,947.33 × 518.60
  4. Step 4: Simplify right side
    1,298.93x = 1,009,885.34
  5. Step 5: Solve for x
    x = 1,009,885.34/1,298.93
  6. Step 6: Final answer
    x = 777.47

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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.