Home / 1,281.60-1,768.77-928.67

Finding the Fourth Proportional to 1,281.60, 1,768.77 and 928.67

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Solution

The fourth proportional to 1,281.60, 1,768.77 and 928.67 is: 1,281.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.60 : 1,768.77 = 928.67 : x
  2. Step 2: Convert to fraction form
    1,281.60/1,768.77 = 928.67/x
  3. Step 3: Cross multiply
    1,281.60x = 1,768.77 × 928.67
  4. Step 4: Simplify right side
    1,281.60x = 1,642,594.79
  5. Step 5: Solve for x
    x = 1,642,594.79/1,281.60
  6. Step 6: Final answer
    x = 1,281.68

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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.