Home / 18,987.40-28,475.71-7,880.35

Finding the Fourth Proportional to 18,987.40, 28,475.71 and 7,880.35

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Solution

The fourth proportional to 18,987.40, 28,475.71 and 7,880.35 is: 11,818.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.40 : 28,475.71 = 7,880.35 : x
  2. Step 2: Convert to fraction form
    18,987.40/28,475.71 = 7,880.35/x
  3. Step 3: Cross multiply
    18,987.40x = 28,475.71 × 7,880.35
  4. Step 4: Simplify right side
    18,987.40x = 224,398,561.30
  5. Step 5: Solve for x
    x = 224,398,561.30/18,987.40
  6. Step 6: Final answer
    x = 11,818.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.