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Finding the Fourth Proportional to 36,689.40, 55,009.80 and 13,312.80

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Solution

The fourth proportional to 36,689.40, 55,009.80 and 13,312.80 is: 19,960.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    36,689.40 : 55,009.80 = 13,312.80 : x
  2. Step 2: Convert to fraction form
    36,689.40/55,009.80 = 13,312.80/x
  3. Step 3: Cross multiply
    36,689.40x = 55,009.80 × 13,312.80
  4. Step 4: Simplify right side
    36,689.40x = 732,334,465.44
  5. Step 5: Solve for x
    x = 732,334,465.44/36,689.40
  6. Step 6: Final answer
    x = 19,960.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.