Home / 15,780.09-21,784.42-9,813.68

Finding the Fourth Proportional to 15,780.09, 21,784.42 and 9,813.68

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Solution

The fourth proportional to 15,780.09, 21,784.42 and 9,813.68 is: 13,547.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780.09 : 21,784.42 = 9,813.68 : x
  2. Step 2: Convert to fraction form
    15,780.09/21,784.42 = 9,813.68/x
  3. Step 3: Cross multiply
    15,780.09x = 21,784.42 × 9,813.68
  4. Step 4: Simplify right side
    15,780.09x = 213,785,356.79
  5. Step 5: Solve for x
    x = 213,785,356.79/15,780.09
  6. Step 6: Final answer
    x = 13,547.79

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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.