Home / 1,417.80-2,128.14-768.84

Finding the Fourth Proportional to 1,417.80, 2,128.14 and 768.84

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Solution

The fourth proportional to 1,417.80, 2,128.14 and 768.84 is: 1,154.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,417.80 : 2,128.14 = 768.84 : x
  2. Step 2: Convert to fraction form
    1,417.80/2,128.14 = 768.84/x
  3. Step 3: Cross multiply
    1,417.80x = 2,128.14 × 768.84
  4. Step 4: Simplify right side
    1,417.80x = 1,636,199.16
  5. Step 5: Solve for x
    x = 1,636,199.16/1,417.80
  6. Step 6: Final answer
    x = 1,154.04

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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.