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Finding the Fourth Proportional to 7,140.40, 10,710.60 and 4,807.60

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Solution

The fourth proportional to 7,140.40, 10,710.60 and 4,807.60 is: 7,211.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,140.40 : 10,710.60 = 4,807.60 : x
  2. Step 2: Convert to fraction form
    7,140.40/10,710.60 = 4,807.60/x
  3. Step 3: Cross multiply
    7,140.40x = 10,710.60 × 4,807.60
  4. Step 4: Simplify right side
    7,140.40x = 51,492,280.56
  5. Step 5: Solve for x
    x = 51,492,280.56/7,140.40
  6. Step 6: Final answer
    x = 7,211.40

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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.