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Finding the Fourth Proportional to 611.99, 912.15 and 577.40

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Solution

The fourth proportional to 611.99, 912.15 and 577.40 is: 860.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.99 : 912.15 = 577.40 : x
  2. Step 2: Convert to fraction form
    611.99/912.15 = 577.40/x
  3. Step 3: Cross multiply
    611.99x = 912.15 × 577.40
  4. Step 4: Simplify right side
    611.99x = 526,670.85
  5. Step 5: Solve for x
    x = 526,670.85/611.99
  6. Step 6: Final answer
    x = 860.59

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1.5x scale

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.