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Finding the Fourth Proportional to 13,389.40, 18,477.18 and 7,421.08

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Solution

The fourth proportional to 13,389.40, 18,477.18 and 7,421.08 is: 10,240.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,389.40 : 18,477.18 = 7,421.08 : x
  2. Step 2: Convert to fraction form
    13,389.40/18,477.18 = 7,421.08/x
  3. Step 3: Cross multiply
    13,389.40x = 18,477.18 × 7,421.08
  4. Step 4: Simplify right side
    13,389.40x = 137,120,630.95
  5. Step 5: Solve for x
    x = 137,120,630.95/13,389.40
  6. Step 6: Final answer
    x = 10,240.98

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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.