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Finding the Fourth Proportional to 753.55, 1,040.00 and 421.99

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Solution

The fourth proportional to 753.55, 1,040.00 and 421.99 is: 582.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.55 : 1,040.00 = 421.99 : x
  2. Step 2: Convert to fraction form
    753.55/1,040.00 = 421.99/x
  3. Step 3: Cross multiply
    753.55x = 1,040.00 × 421.99
  4. Step 4: Simplify right side
    753.55x = 438,864.89
  5. Step 5: Solve for x
    x = 438,864.89/753.55
  6. Step 6: Final answer
    x = 582.40

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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.