Home / 1,210.96-1,812.60-1,128.40

Finding the Fourth Proportional to 1,210.96, 1,812.60 and 1,128.40

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Solution

The fourth proportional to 1,210.96, 1,812.60 and 1,128.40 is: 1,689.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.96 : 1,812.60 = 1,128.40 : x
  2. Step 2: Convert to fraction form
    1,210.96/1,812.60 = 1,128.40/x
  3. Step 3: Cross multiply
    1,210.96x = 1,812.60 × 1,128.40
  4. Step 4: Simplify right side
    1,210.96x = 2,045,337.84
  5. Step 5: Solve for x
    x = 2,045,337.84/1,210.96
  6. Step 6: Final answer
    x = 1,689.02

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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.