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Finding the Fourth Proportional to 2,117.64, 3,176.40 and 656.76

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Solution

The fourth proportional to 2,117.64, 3,176.40 and 656.76 is: 985.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,117.64 : 3,176.40 = 656.76 : x
  2. Step 2: Convert to fraction form
    2,117.64/3,176.40 = 656.76/x
  3. Step 3: Cross multiply
    2,117.64x = 3,176.40 × 656.76
  4. Step 4: Simplify right side
    2,117.64x = 2,086,132.46
  5. Step 5: Solve for x
    x = 2,086,132.46/2,117.64
  6. Step 6: Final answer
    x = 985.12

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1.5x scale

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.