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Finding the Fourth Proportional to 953.55, 1,315.91 and 555.31

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Solution

The fourth proportional to 953.55, 1,315.91 and 555.31 is: 766.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.55 : 1,315.91 = 555.31 : x
  2. Step 2: Convert to fraction form
    953.55/1,315.91 = 555.31/x
  3. Step 3: Cross multiply
    953.55x = 1,315.91 × 555.31
  4. Step 4: Simplify right side
    953.55x = 730,731.92
  5. Step 5: Solve for x
    x = 730,731.92/953.55
  6. Step 6: Final answer
    x = 766.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.