Home / 1,351.86-2,035.16-921.78

Finding the Fourth Proportional to 1,351.86, 2,035.16 and 921.78

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Solution

The fourth proportional to 1,351.86, 2,035.16 and 921.78 is: 1,387.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.86 : 2,035.16 = 921.78 : x
  2. Step 2: Convert to fraction form
    1,351.86/2,035.16 = 921.78/x
  3. Step 3: Cross multiply
    1,351.86x = 2,035.16 × 921.78
  4. Step 4: Simplify right side
    1,351.86x = 1,875,965.18
  5. Step 5: Solve for x
    x = 1,875,965.18/1,351.86
  6. Step 6: Final answer
    x = 1,387.69

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.