Home / 13,328.40-18,390.60-9,343.20

Finding the Fourth Proportional to 13,328.40, 18,390.60 and 9,343.20

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Solution

The fourth proportional to 13,328.40, 18,390.60 and 9,343.20 is: 12,891.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,328.40 : 18,390.60 = 9,343.20 : x
  2. Step 2: Convert to fraction form
    13,328.40/18,390.60 = 9,343.20/x
  3. Step 3: Cross multiply
    13,328.40x = 18,390.60 × 9,343.20
  4. Step 4: Simplify right side
    13,328.40x = 171,827,053.92
  5. Step 5: Solve for x
    x = 171,827,053.92/13,328.40
  6. Step 6: Final answer
    x = 12,891.80

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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.