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Finding the Fourth Proportional to 711.18, 1,065.60 and 436.69

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Solution

The fourth proportional to 711.18, 1,065.60 and 436.69 is: 654.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.18 : 1,065.60 = 436.69 : x
  2. Step 2: Convert to fraction form
    711.18/1,065.60 = 436.69/x
  3. Step 3: Cross multiply
    711.18x = 1,065.60 × 436.69
  4. Step 4: Simplify right side
    711.18x = 465,336.86
  5. Step 5: Solve for x
    x = 465,336.86/711.18
  6. Step 6: Final answer
    x = 654.32

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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.