Home / 1,128.20-1,694.14-947.08

Finding the Fourth Proportional to 1,128.20, 1,694.14 and 947.08

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Solution

The fourth proportional to 1,128.20, 1,694.14 and 947.08 is: 1,422.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.20 : 1,694.14 = 947.08 : x
  2. Step 2: Convert to fraction form
    1,128.20/1,694.14 = 947.08/x
  3. Step 3: Cross multiply
    1,128.20x = 1,694.14 × 947.08
  4. Step 4: Simplify right side
    1,128.20x = 1,604,486.11
  5. Step 5: Solve for x
    x = 1,604,486.11/1,128.20
  6. Step 6: Final answer
    x = 1,422.16

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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.