Home / 10,390.40-15,549.15-7,109.90

Finding the Fourth Proportional to 10,390.40, 15,549.15 and 7,109.90

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Solution

The fourth proportional to 10,390.40, 15,549.15 and 7,109.90 is: 10,639.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,390.40 : 15,549.15 = 7,109.90 : x
  2. Step 2: Convert to fraction form
    10,390.40/15,549.15 = 7,109.90/x
  3. Step 3: Cross multiply
    10,390.40x = 15,549.15 × 7,109.90
  4. Step 4: Simplify right side
    10,390.40x = 110,552,901.59
  5. Step 5: Solve for x
    x = 110,552,901.59/10,390.40
  6. Step 6: Final answer
    x = 10,639.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.