Home / 1,289.05-1,928.95-1,116.31

Finding the Fourth Proportional to 1,289.05, 1,928.95 and 1,116.31

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Solution

The fourth proportional to 1,289.05, 1,928.95 and 1,116.31 is: 1,670.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.05 : 1,928.95 = 1,116.31 : x
  2. Step 2: Convert to fraction form
    1,289.05/1,928.95 = 1,116.31/x
  3. Step 3: Cross multiply
    1,289.05x = 1,928.95 × 1,116.31
  4. Step 4: Simplify right side
    1,289.05x = 2,153,306.17
  5. Step 5: Solve for x
    x = 2,153,306.17/1,289.05
  6. Step 6: Final answer
    x = 1,670.46

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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.