Home / 1,405.15-1,952.51-1,389.96

Finding the Fourth Proportional to 1,405.15, 1,952.51 and 1,389.96

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Solution

The fourth proportional to 1,405.15, 1,952.51 and 1,389.96 is: 1,931.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.15 : 1,952.51 = 1,389.96 : x
  2. Step 2: Convert to fraction form
    1,405.15/1,952.51 = 1,389.96/x
  3. Step 3: Cross multiply
    1,405.15x = 1,952.51 × 1,389.96
  4. Step 4: Simplify right side
    1,405.15x = 2,713,903.85
  5. Step 5: Solve for x
    x = 2,713,903.85/1,405.15
  6. Step 6: Final answer
    x = 1,931.40

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.