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Finding the Fourth Proportional to 1,113.54, 1,670.31 and 420.18

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Solution

The fourth proportional to 1,113.54, 1,670.31 and 420.18 is: 630.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.54 : 1,670.31 = 420.18 : x
  2. Step 2: Convert to fraction form
    1,113.54/1,670.31 = 420.18/x
  3. Step 3: Cross multiply
    1,113.54x = 1,670.31 × 420.18
  4. Step 4: Simplify right side
    1,113.54x = 701,830.86
  5. Step 5: Solve for x
    x = 701,830.86/1,113.54
  6. Step 6: Final answer
    x = 630.27

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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.