Home / 31,154.14-42,987.64-18,405.55

Finding the Fourth Proportional to 31,154.14, 42,987.64 and 18,405.55

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Solution

The fourth proportional to 31,154.14, 42,987.64 and 18,405.55 is: 25,396.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,154.14 : 42,987.64 = 18,405.55 : x
  2. Step 2: Convert to fraction form
    31,154.14/42,987.64 = 18,405.55/x
  3. Step 3: Cross multiply
    31,154.14x = 42,987.64 × 18,405.55
  4. Step 4: Simplify right side
    31,154.14x = 791,211,157.40
  5. Step 5: Solve for x
    x = 791,211,157.40/31,154.14
  6. Step 6: Final answer
    x = 25,396.66

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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.