Home / 13,421.47-18,520.27-7,835.71

Finding the Fourth Proportional to 13,421.47, 18,520.27 and 7,835.71

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Solution

The fourth proportional to 13,421.47, 18,520.27 and 7,835.71 is: 10,812.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.47 : 18,520.27 = 7,835.71 : x
  2. Step 2: Convert to fraction form
    13,421.47/18,520.27 = 7,835.71/x
  3. Step 3: Cross multiply
    13,421.47x = 18,520.27 × 7,835.71
  4. Step 4: Simplify right side
    13,421.47x = 145,119,464.84
  5. Step 5: Solve for x
    x = 145,119,464.84/13,421.47
  6. Step 6: Final answer
    x = 10,812.49

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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.