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Finding the Fourth Proportional to 4,753.05, 7,130.79 and 1,978.80

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Solution

The fourth proportional to 4,753.05, 7,130.79 and 1,978.80 is: 2,968.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,753.05 : 7,130.79 = 1,978.80 : x
  2. Step 2: Convert to fraction form
    4,753.05/7,130.79 = 1,978.80/x
  3. Step 3: Cross multiply
    4,753.05x = 7,130.79 × 1,978.80
  4. Step 4: Simplify right side
    4,753.05x = 14,110,397.36
  5. Step 5: Solve for x
    x = 14,110,397.36/4,753.05
  6. Step 6: Final answer
    x = 2,968.70

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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.