Home / 1,127.50-1,688.68-921.76

Finding the Fourth Proportional to 1,127.50, 1,688.68 and 921.76

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Solution

The fourth proportional to 1,127.50, 1,688.68 and 921.76 is: 1,380.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.50 : 1,688.68 = 921.76 : x
  2. Step 2: Convert to fraction form
    1,127.50/1,688.68 = 921.76/x
  3. Step 3: Cross multiply
    1,127.50x = 1,688.68 × 921.76
  4. Step 4: Simplify right side
    1,127.50x = 1,556,557.68
  5. Step 5: Solve for x
    x = 1,556,557.68/1,127.50
  6. Step 6: Final answer
    x = 1,380.54

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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.