Home / 9,259.72-12,778.40-5,280.80

Finding the Fourth Proportional to 9,259.72, 12,778.40 and 5,280.80

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Solution

The fourth proportional to 9,259.72, 12,778.40 and 5,280.80 is: 7,287.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,259.72 : 12,778.40 = 5,280.80 : x
  2. Step 2: Convert to fraction form
    9,259.72/12,778.40 = 5,280.80/x
  3. Step 3: Cross multiply
    9,259.72x = 12,778.40 × 5,280.80
  4. Step 4: Simplify right side
    9,259.72x = 67,480,174.72
  5. Step 5: Solve for x
    x = 67,480,174.72/9,259.72
  6. Step 6: Final answer
    x = 7,287.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.