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Finding the Fourth Proportional to 955.20, 1,430.88 and 612.48

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Solution

The fourth proportional to 955.20, 1,430.88 and 612.48 is: 917.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.20 : 1,430.88 = 612.48 : x
  2. Step 2: Convert to fraction form
    955.20/1,430.88 = 612.48/x
  3. Step 3: Cross multiply
    955.20x = 1,430.88 × 612.48
  4. Step 4: Simplify right side
    955.20x = 876,385.38
  5. Step 5: Solve for x
    x = 876,385.38/955.20
  6. Step 6: Final answer
    x = 917.49

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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.