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Finding the Fourth Proportional to 693.90, 1,041.53 and 420.53

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Solution

The fourth proportional to 693.90, 1,041.53 and 420.53 is: 631.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.90 : 1,041.53 = 420.53 : x
  2. Step 2: Convert to fraction form
    693.90/1,041.53 = 420.53/x
  3. Step 3: Cross multiply
    693.90x = 1,041.53 × 420.53
  4. Step 4: Simplify right side
    693.90x = 437,987.30
  5. Step 5: Solve for x
    x = 437,987.30/693.90
  6. Step 6: Final answer
    x = 631.20

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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.