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Finding the Fourth Proportional to 5,280.40, 7,904.40 and 4,988.80

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Solution

The fourth proportional to 5,280.40, 7,904.40 and 4,988.80 is: 7,467.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,280.40 : 7,904.40 = 4,988.80 : x
  2. Step 2: Convert to fraction form
    5,280.40/7,904.40 = 4,988.80/x
  3. Step 3: Cross multiply
    5,280.40x = 7,904.40 × 4,988.80
  4. Step 4: Simplify right side
    5,280.40x = 39,433,470.72
  5. Step 5: Solve for x
    x = 39,433,470.72/5,280.40
  6. Step 6: Final answer
    x = 7,467.89

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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.