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Finding the Fourth Proportional to 711.64, 1,065 and 528.64

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Solution

The fourth proportional to 711.64, 1,065 and 528.64 is: 791.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.64 : 1,065 = 528.64 : x
  2. Step 2: Convert to fraction form
    711.64/1,065 = 528.64/x
  3. Step 3: Cross multiply
    711.64x = 1,065 × 528.64
  4. Step 4: Simplify right side
    711.64x = 563,001.60
  5. Step 5: Solve for x
    x = 563,001.60/711.64
  6. Step 6: Final answer
    x = 791.13

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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.