Home / 20,979.84-28,953-11,549.28

Finding the Fourth Proportional to 20,979.84, 28,953 and 11,549.28

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Solution

The fourth proportional to 20,979.84, 28,953 and 11,549.28 is: 15,938.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.84 : 28,953 = 11,549.28 : x
  2. Step 2: Convert to fraction form
    20,979.84/28,953 = 11,549.28/x
  3. Step 3: Cross multiply
    20,979.84x = 28,953 × 11,549.28
  4. Step 4: Simplify right side
    20,979.84x = 334,386,303.84
  5. Step 5: Solve for x
    x = 334,386,303.84/20,979.84
  6. Step 6: Final answer
    x = 15,938.46

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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.