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Finding the Fourth Proportional to 955.12, 1,316.10 and 660.28

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Solution

The fourth proportional to 955.12, 1,316.10 and 660.28 is: 909.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.12 : 1,316.10 = 660.28 : x
  2. Step 2: Convert to fraction form
    955.12/1,316.10 = 660.28/x
  3. Step 3: Cross multiply
    955.12x = 1,316.10 × 660.28
  4. Step 4: Simplify right side
    955.12x = 868,994.51
  5. Step 5: Solve for x
    x = 868,994.51/955.12
  6. Step 6: Final answer
    x = 909.83

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1.5x scale

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.