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Finding the Fourth Proportional to 661.60, 994.80 and 647.20

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Solution

The fourth proportional to 661.60, 994.80 and 647.20 is: 973.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.60 : 994.80 = 647.20 : x
  2. Step 2: Convert to fraction form
    661.60/994.80 = 647.20/x
  3. Step 3: Cross multiply
    661.60x = 994.80 × 647.20
  4. Step 4: Simplify right side
    661.60x = 643,834.56
  5. Step 5: Solve for x
    x = 643,834.56/661.60
  6. Step 6: Final answer
    x = 973.15

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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.