Home / 15,291.54-21,106.80-9,987.17

Finding the Fourth Proportional to 15,291.54, 21,106.80 and 9,987.17

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Solution

The fourth proportional to 15,291.54, 21,106.80 and 9,987.17 is: 13,785.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,291.54 : 21,106.80 = 9,987.17 : x
  2. Step 2: Convert to fraction form
    15,291.54/21,106.80 = 9,987.17/x
  3. Step 3: Cross multiply
    15,291.54x = 21,106.80 × 9,987.17
  4. Step 4: Simplify right side
    15,291.54x = 210,797,094.22
  5. Step 5: Solve for x
    x = 210,797,094.22/15,291.54
  6. Step 6: Final answer
    x = 13,785.21

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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.