Home / 1,439.40-1,985.31-1,066.40

Finding the Fourth Proportional to 1,439.40, 1,985.31 and 1,066.40

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Solution

The fourth proportional to 1,439.40, 1,985.31 and 1,066.40 is: 1,470.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.40 : 1,985.31 = 1,066.40 : x
  2. Step 2: Convert to fraction form
    1,439.40/1,985.31 = 1,066.40/x
  3. Step 3: Cross multiply
    1,439.40x = 1,985.31 × 1,066.40
  4. Step 4: Simplify right side
    1,439.40x = 2,117,124.66
  5. Step 5: Solve for x
    x = 2,117,124.66/1,439.40
  6. Step 6: Final answer
    x = 1,470.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.