Home / 1,242.15-1,870.65-1,131.43

Finding the Fourth Proportional to 1,242.15, 1,870.65 and 1,131.43

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Solution

The fourth proportional to 1,242.15, 1,870.65 and 1,131.43 is: 1,703.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.15 : 1,870.65 = 1,131.43 : x
  2. Step 2: Convert to fraction form
    1,242.15/1,870.65 = 1,131.43/x
  3. Step 3: Cross multiply
    1,242.15x = 1,870.65 × 1,131.43
  4. Step 4: Simplify right side
    1,242.15x = 2,116,509.53
  5. Step 5: Solve for x
    x = 2,116,509.53/1,242.15
  6. Step 6: Final answer
    x = 1,703.91

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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.