Home / 13,420.88-18,510.56-9,117.30

Finding the Fourth Proportional to 13,420.88, 18,510.56 and 9,117.30

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Solution

The fourth proportional to 13,420.88, 18,510.56 and 9,117.30 is: 12,574.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.88 : 18,510.56 = 9,117.30 : x
  2. Step 2: Convert to fraction form
    13,420.88/18,510.56 = 9,117.30/x
  3. Step 3: Cross multiply
    13,420.88x = 18,510.56 × 9,117.30
  4. Step 4: Simplify right side
    13,420.88x = 168,766,190.55
  5. Step 5: Solve for x
    x = 168,766,190.55/13,420.88
  6. Step 6: Final answer
    x = 12,574.90

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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.