Home / 1,289.49-1,780.18-1,009.13

Finding the Fourth Proportional to 1,289.49, 1,780.18 and 1,009.13

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Solution

The fourth proportional to 1,289.49, 1,780.18 and 1,009.13 is: 1,393.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.49 : 1,780.18 = 1,009.13 : x
  2. Step 2: Convert to fraction form
    1,289.49/1,780.18 = 1,009.13/x
  3. Step 3: Cross multiply
    1,289.49x = 1,780.18 × 1,009.13
  4. Step 4: Simplify right side
    1,289.49x = 1,796,421.62
  5. Step 5: Solve for x
    x = 1,796,421.62/1,289.49
  6. Step 6: Final answer
    x = 1,393.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.