Home / 1,355.18-2,030.90-660.47

Finding the Fourth Proportional to 1,355.18, 2,030.90 and 660.47

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Solution

The fourth proportional to 1,355.18, 2,030.90 and 660.47 is: 989.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.18 : 2,030.90 = 660.47 : x
  2. Step 2: Convert to fraction form
    1,355.18/2,030.90 = 660.47/x
  3. Step 3: Cross multiply
    1,355.18x = 2,030.90 × 660.47
  4. Step 4: Simplify right side
    1,355.18x = 1,341,335.07
  5. Step 5: Solve for x
    x = 1,341,335.07/1,355.18
  6. Step 6: Final answer
    x = 989.79

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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.