Home / 5,420.40-8,130.60-4,750.80

Finding the Fourth Proportional to 5,420.40, 8,130.60 and 4,750.80

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Solution

The fourth proportional to 5,420.40, 8,130.60 and 4,750.80 is: 7,126.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,420.40 : 8,130.60 = 4,750.80 : x
  2. Step 2: Convert to fraction form
    5,420.40/8,130.60 = 4,750.80/x
  3. Step 3: Cross multiply
    5,420.40x = 8,130.60 × 4,750.80
  4. Step 4: Simplify right side
    5,420.40x = 38,626,854.48
  5. Step 5: Solve for x
    x = 38,626,854.48/5,420.40
  6. Step 6: Final answer
    x = 7,126.20

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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.