Home / 8,781.20-13,152.60-5,312.40

Finding the Fourth Proportional to 8,781.20, 13,152.60 and 5,312.40

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Solution

The fourth proportional to 8,781.20, 13,152.60 and 5,312.40 is: 7,956.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,781.20 : 13,152.60 = 5,312.40 : x
  2. Step 2: Convert to fraction form
    8,781.20/13,152.60 = 5,312.40/x
  3. Step 3: Cross multiply
    8,781.20x = 13,152.60 × 5,312.40
  4. Step 4: Simplify right side
    8,781.20x = 69,871,872.24
  5. Step 5: Solve for x
    x = 69,871,872.24/8,781.20
  6. Step 6: Final answer
    x = 7,956.98

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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.