Home / 1,127.15-1,690.51-305.31

Finding the Fourth Proportional to 1,127.15, 1,690.51 and 305.31

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Solution

The fourth proportional to 1,127.15, 1,690.51 and 305.31 is: 457.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.15 : 1,690.51 = 305.31 : x
  2. Step 2: Convert to fraction form
    1,127.15/1,690.51 = 305.31/x
  3. Step 3: Cross multiply
    1,127.15x = 1,690.51 × 305.31
  4. Step 4: Simplify right side
    1,127.15x = 516,130.14
  5. Step 5: Solve for x
    x = 516,130.14/1,127.15
  6. Step 6: Final answer
    x = 457.91

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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.