Home / 1,318.80-1,979.17-625.47

Finding the Fourth Proportional to 1,318.80, 1,979.17 and 625.47

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Solution

The fourth proportional to 1,318.80, 1,979.17 and 625.47 is: 938.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.80 : 1,979.17 = 625.47 : x
  2. Step 2: Convert to fraction form
    1,318.80/1,979.17 = 625.47/x
  3. Step 3: Cross multiply
    1,318.80x = 1,979.17 × 625.47
  4. Step 4: Simplify right side
    1,318.80x = 1,237,903.13
  5. Step 5: Solve for x
    x = 1,237,903.13/1,318.80
  6. Step 6: Final answer
    x = 938.66

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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.