Home / 2,931.64-4,045-1,987.56

Finding the Fourth Proportional to 2,931.64, 4,045 and 1,987.56

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Solution

The fourth proportional to 2,931.64, 4,045 and 1,987.56 is: 2,742.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,931.64 : 4,045 = 1,987.56 : x
  2. Step 2: Convert to fraction form
    2,931.64/4,045 = 1,987.56/x
  3. Step 3: Cross multiply
    2,931.64x = 4,045 × 1,987.56
  4. Step 4: Simplify right side
    2,931.64x = 8,039,680.20
  5. Step 5: Solve for x
    x = 8,039,680.20/2,931.64
  6. Step 6: Final answer
    x = 2,742.38

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1.5x scale

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.