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Finding the Fourth Proportional to 1,113.74, 1,670.85 and 420.62

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Solution

The fourth proportional to 1,113.74, 1,670.85 and 420.62 is: 631.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.74 : 1,670.85 = 420.62 : x
  2. Step 2: Convert to fraction form
    1,113.74/1,670.85 = 420.62/x
  3. Step 3: Cross multiply
    1,113.74x = 1,670.85 × 420.62
  4. Step 4: Simplify right side
    1,113.74x = 702,792.93
  5. Step 5: Solve for x
    x = 702,792.93/1,113.74
  6. Step 6: Final answer
    x = 631.02

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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.