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Finding the Fourth Proportional to 611.55, 912.47 and 530.55

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Solution

The fourth proportional to 611.55, 912.47 and 530.55 is: 791.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.55 : 912.47 = 530.55 : x
  2. Step 2: Convert to fraction form
    611.55/912.47 = 530.55/x
  3. Step 3: Cross multiply
    611.55x = 912.47 × 530.55
  4. Step 4: Simplify right side
    611.55x = 484,108.31
  5. Step 5: Solve for x
    x = 484,108.31/611.55
  6. Step 6: Final answer
    x = 791.61

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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.