Home / 1,121.18-1,681.93-390.56

Finding the Fourth Proportional to 1,121.18, 1,681.93 and 390.56

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Solution

The fourth proportional to 1,121.18, 1,681.93 and 390.56 is: 585.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.18 : 1,681.93 = 390.56 : x
  2. Step 2: Convert to fraction form
    1,121.18/1,681.93 = 390.56/x
  3. Step 3: Cross multiply
    1,121.18x = 1,681.93 × 390.56
  4. Step 4: Simplify right side
    1,121.18x = 656,886.66
  5. Step 5: Solve for x
    x = 656,886.66/1,121.18
  6. Step 6: Final answer
    x = 585.89

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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.