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Finding the Fourth Proportional to 711.12, 1,065.59 and 479.15

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Solution

The fourth proportional to 711.12, 1,065.59 and 479.15 is: 717.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.12 : 1,065.59 = 479.15 : x
  2. Step 2: Convert to fraction form
    711.12/1,065.59 = 479.15/x
  3. Step 3: Cross multiply
    711.12x = 1,065.59 × 479.15
  4. Step 4: Simplify right side
    711.12x = 510,577.45
  5. Step 5: Solve for x
    x = 510,577.45/711.12
  6. Step 6: Final answer
    x = 717.99

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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.