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Finding the Fourth Proportional to 30,369.60, 45,554.40 and 12,859.20

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Solution

The fourth proportional to 30,369.60, 45,554.40 and 12,859.20 is: 19,288.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,369.60 : 45,554.40 = 12,859.20 : x
  2. Step 2: Convert to fraction form
    30,369.60/45,554.40 = 12,859.20/x
  3. Step 3: Cross multiply
    30,369.60x = 45,554.40 × 12,859.20
  4. Step 4: Simplify right side
    30,369.60x = 585,793,140.48
  5. Step 5: Solve for x
    x = 585,793,140.48/30,369.60
  6. Step 6: Final answer
    x = 19,288.80

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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.