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Finding the Fourth Proportional to 971.11, 1,340.08 and 528.99

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Solution

The fourth proportional to 971.11, 1,340.08 and 528.99 is: 729.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.11 : 1,340.08 = 528.99 : x
  2. Step 2: Convert to fraction form
    971.11/1,340.08 = 528.99/x
  3. Step 3: Cross multiply
    971.11x = 1,340.08 × 528.99
  4. Step 4: Simplify right side
    971.11x = 708,888.92
  5. Step 5: Solve for x
    x = 708,888.92/971.11
  6. Step 6: Final answer
    x = 729.98

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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.