Home / 1,129.29-1,685.76-976.20

Finding the Fourth Proportional to 1,129.29, 1,685.76 and 976.20

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Solution

The fourth proportional to 1,129.29, 1,685.76 and 976.20 is: 1,457.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.29 : 1,685.76 = 976.20 : x
  2. Step 2: Convert to fraction form
    1,129.29/1,685.76 = 976.20/x
  3. Step 3: Cross multiply
    1,129.29x = 1,685.76 × 976.20
  4. Step 4: Simplify right side
    1,129.29x = 1,645,638.91
  5. Step 5: Solve for x
    x = 1,645,638.91/1,129.29
  6. Step 6: Final answer
    x = 1,457.23

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.