Home / 13,128.61-18,118.55-7,465.13

Finding the Fourth Proportional to 13,128.61, 18,118.55 and 7,465.13

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Solution

The fourth proportional to 13,128.61, 18,118.55 and 7,465.13 is: 10,302.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.61 : 18,118.55 = 7,465.13 : x
  2. Step 2: Convert to fraction form
    13,128.61/18,118.55 = 7,465.13/x
  3. Step 3: Cross multiply
    13,128.61x = 18,118.55 × 7,465.13
  4. Step 4: Simplify right side
    13,128.61x = 135,257,331.16
  5. Step 5: Solve for x
    x = 135,257,331.16/13,128.61
  6. Step 6: Final answer
    x = 10,302.49

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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.