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Finding the Fourth Proportional to 715.85, 1,068.07 and 611.99

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Solution

The fourth proportional to 715.85, 1,068.07 and 611.99 is: 913.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.85 : 1,068.07 = 611.99 : x
  2. Step 2: Convert to fraction form
    715.85/1,068.07 = 611.99/x
  3. Step 3: Cross multiply
    715.85x = 1,068.07 × 611.99
  4. Step 4: Simplify right side
    715.85x = 653,645.10
  5. Step 5: Solve for x
    x = 653,645.10/715.85
  6. Step 6: Final answer
    x = 913.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.