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Finding the Fourth Proportional to 28,292.80, 42,411.20 and 12,506.40

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Solution

The fourth proportional to 28,292.80, 42,411.20 and 12,506.40 is: 18,747.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,292.80 : 42,411.20 = 12,506.40 : x
  2. Step 2: Convert to fraction form
    28,292.80/42,411.20 = 12,506.40/x
  3. Step 3: Cross multiply
    28,292.80x = 42,411.20 × 12,506.40
  4. Step 4: Simplify right side
    28,292.80x = 530,411,431.68
  5. Step 5: Solve for x
    x = 530,411,431.68/28,292.80
  6. Step 6: Final answer
    x = 18,747.22

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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.