Home / 9,905.80-13,669.50-5,428.75

Finding the Fourth Proportional to 9,905.80, 13,669.50 and 5,428.75

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Solution

The fourth proportional to 9,905.80, 13,669.50 and 5,428.75 is: 7,491.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,905.80 : 13,669.50 = 5,428.75 : x
  2. Step 2: Convert to fraction form
    9,905.80/13,669.50 = 5,428.75/x
  3. Step 3: Cross multiply
    9,905.80x = 13,669.50 × 5,428.75
  4. Step 4: Simplify right side
    9,905.80x = 74,208,298.13
  5. Step 5: Solve for x
    x = 74,208,298.13/9,905.80
  6. Step 6: Final answer
    x = 7,491.40

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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.