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Finding the Fourth Proportional to 687.59, 1,030.37 and 631.02

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Solution

The fourth proportional to 687.59, 1,030.37 and 631.02 is: 945.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.59 : 1,030.37 = 631.02 : x
  2. Step 2: Convert to fraction form
    687.59/1,030.37 = 631.02/x
  3. Step 3: Cross multiply
    687.59x = 1,030.37 × 631.02
  4. Step 4: Simplify right side
    687.59x = 650,180.92
  5. Step 5: Solve for x
    x = 650,180.92/687.59
  6. Step 6: Final answer
    x = 945.60

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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.