Home / 15,291.40-21,106.62-9,987.04

Finding the Fourth Proportional to 15,291.40, 21,106.62 and 9,987.04

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Solution

The fourth proportional to 15,291.40, 21,106.62 and 9,987.04 is: 13,785.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,291.40 : 21,106.62 = 9,987.04 : x
  2. Step 2: Convert to fraction form
    15,291.40/21,106.62 = 9,987.04/x
  3. Step 3: Cross multiply
    15,291.40x = 21,106.62 × 9,987.04
  4. Step 4: Simplify right side
    15,291.40x = 210,792,658.20
  5. Step 5: Solve for x
    x = 210,792,658.20/15,291.40
  6. Step 6: Final answer
    x = 13,785.05

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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.