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Finding the Fourth Proportional to 657.30, 980.75 and 640.74

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Solution

The fourth proportional to 657.30, 980.75 and 640.74 is: 956.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.30 : 980.75 = 640.74 : x
  2. Step 2: Convert to fraction form
    657.30/980.75 = 640.74/x
  3. Step 3: Cross multiply
    657.30x = 980.75 × 640.74
  4. Step 4: Simplify right side
    657.30x = 628,402.55
  5. Step 5: Solve for x
    x = 628,402.55/657.30
  6. Step 6: Final answer
    x = 956.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.