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Finding the Fourth Proportional to 953.50, 1,315.85 and 539.50

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Solution

The fourth proportional to 953.50, 1,315.85 and 539.50 is: 744.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.50 : 1,315.85 = 539.50 : x
  2. Step 2: Convert to fraction form
    953.50/1,315.85 = 539.50/x
  3. Step 3: Cross multiply
    953.50x = 1,315.85 × 539.50
  4. Step 4: Simplify right side
    953.50x = 709,901.08
  5. Step 5: Solve for x
    x = 709,901.08/953.50
  6. Step 6: Final answer
    x = 744.52

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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.