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Finding the Fourth Proportional to 1,172.12, 1,618.34 and 730.12

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Solution

The fourth proportional to 1,172.12, 1,618.34 and 730.12 is: 1,008.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.12 : 1,618.34 = 730.12 : x
  2. Step 2: Convert to fraction form
    1,172.12/1,618.34 = 730.12/x
  3. Step 3: Cross multiply
    1,172.12x = 1,618.34 × 730.12
  4. Step 4: Simplify right side
    1,172.12x = 1,181,582.40
  5. Step 5: Solve for x
    x = 1,181,582.40/1,172.12
  6. Step 6: Final answer
    x = 1,008.07

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1.5x scale

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.