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Finding the Fourth Proportional to 945.58, 1,415.40 and 611.58

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Solution

The fourth proportional to 945.58, 1,415.40 and 611.58 is: 915.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.58 : 1,415.40 = 611.58 : x
  2. Step 2: Convert to fraction form
    945.58/1,415.40 = 611.58/x
  3. Step 3: Cross multiply
    945.58x = 1,415.40 × 611.58
  4. Step 4: Simplify right side
    945.58x = 865,633.67
  5. Step 5: Solve for x
    x = 865,633.67/945.58
  6. Step 6: Final answer
    x = 915.45

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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.