Home / 15,621.12-21,531.83-9,639.68

Finding the Fourth Proportional to 15,621.12, 21,531.83 and 9,639.68

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Solution

The fourth proportional to 15,621.12, 21,531.83 and 9,639.68 is: 13,287.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,621.12 : 21,531.83 = 9,639.68 : x
  2. Step 2: Convert to fraction form
    15,621.12/21,531.83 = 9,639.68/x
  3. Step 3: Cross multiply
    15,621.12x = 21,531.83 × 9,639.68
  4. Step 4: Simplify right side
    15,621.12x = 207,559,795.16
  5. Step 5: Solve for x
    x = 207,559,795.16/15,621.12
  6. Step 6: Final answer
    x = 13,287.13

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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.