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Finding the Fourth Proportional to 1,070.20, 1,477.50 and 721.24

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Solution

The fourth proportional to 1,070.20, 1,477.50 and 721.24 is: 995.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.20 : 1,477.50 = 721.24 : x
  2. Step 2: Convert to fraction form
    1,070.20/1,477.50 = 721.24/x
  3. Step 3: Cross multiply
    1,070.20x = 1,477.50 × 721.24
  4. Step 4: Simplify right side
    1,070.20x = 1,065,632.10
  5. Step 5: Solve for x
    x = 1,065,632.10/1,070.20
  6. Step 6: Final answer
    x = 995.73

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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.