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Finding the Fourth Proportional to 717.02, 989.51 and 451.55

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Solution

The fourth proportional to 717.02, 989.51 and 451.55 is: 623.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.02 : 989.51 = 451.55 : x
  2. Step 2: Convert to fraction form
    717.02/989.51 = 451.55/x
  3. Step 3: Cross multiply
    717.02x = 989.51 × 451.55
  4. Step 4: Simplify right side
    717.02x = 446,806.04
  5. Step 5: Solve for x
    x = 446,806.04/717.02
  6. Step 6: Final answer
    x = 623.15

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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.