Home / 12,880.14-17,782.50-9,890.16

Finding the Fourth Proportional to 12,880.14, 17,782.50 and 9,890.16

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Solution

The fourth proportional to 12,880.14, 17,782.50 and 9,890.16 is: 13,654.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,880.14 : 17,782.50 = 9,890.16 : x
  2. Step 2: Convert to fraction form
    12,880.14/17,782.50 = 9,890.16/x
  3. Step 3: Cross multiply
    12,880.14x = 17,782.50 × 9,890.16
  4. Step 4: Simplify right side
    12,880.14x = 175,871,770.20
  5. Step 5: Solve for x
    x = 175,871,770.20/12,880.14
  6. Step 6: Final answer
    x = 13,654.49

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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.