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Finding the Fourth Proportional to 4,880, 7,320 and 1,417.28

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Solution

The fourth proportional to 4,880, 7,320 and 1,417.28 is: 2,125.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,880 : 7,320 = 1,417.28 : x
  2. Step 2: Convert to fraction form
    4,880/7,320 = 1,417.28/x
  3. Step 3: Cross multiply
    4,880x = 7,320 × 1,417.28
  4. Step 4: Simplify right side
    4,880x = 10,374,489.60
  5. Step 5: Solve for x
    x = 10,374,489.60/4,880
  6. Step 6: Final answer
    x = 2,125.92

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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.