Home / 13,316.08-18,378.36-7,939.20

Finding the Fourth Proportional to 13,316.08, 18,378.36 and 7,939.20

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Solution

The fourth proportional to 13,316.08, 18,378.36 and 7,939.20 is: 10,957.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,316.08 : 18,378.36 = 7,939.20 : x
  2. Step 2: Convert to fraction form
    13,316.08/18,378.36 = 7,939.20/x
  3. Step 3: Cross multiply
    13,316.08x = 18,378.36 × 7,939.20
  4. Step 4: Simplify right side
    13,316.08x = 145,909,475.71
  5. Step 5: Solve for x
    x = 145,909,475.71/13,316.08
  6. Step 6: Final answer
    x = 10,957.39

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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.