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Finding the Fourth Proportional to 1,113.54, 1,670.91 and 420.68

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Solution

The fourth proportional to 1,113.54, 1,670.91 and 420.68 is: 631.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.54 : 1,670.91 = 420.68 : x
  2. Step 2: Convert to fraction form
    1,113.54/1,670.91 = 420.68/x
  3. Step 3: Cross multiply
    1,113.54x = 1,670.91 × 420.68
  4. Step 4: Simplify right side
    1,113.54x = 702,910.06
  5. Step 5: Solve for x
    x = 702,910.06/1,113.54
  6. Step 6: Final answer
    x = 631.24

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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.