Home / 28,298.80-42,420.20-12,512.40

Finding the Fourth Proportional to 28,298.80, 42,420.20 and 12,512.40

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Solution

The fourth proportional to 28,298.80, 42,420.20 and 12,512.40 is: 18,756.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,298.80 : 42,420.20 = 12,512.40 : x
  2. Step 2: Convert to fraction form
    28,298.80/42,420.20 = 12,512.40/x
  3. Step 3: Cross multiply
    28,298.80x = 42,420.20 × 12,512.40
  4. Step 4: Simplify right side
    28,298.80x = 530,778,510.48
  5. Step 5: Solve for x
    x = 530,778,510.48/28,298.80
  6. Step 6: Final answer
    x = 18,756.22

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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.