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Finding the Fourth Proportional to 973.05, 1,341.90 and 640.89

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Solution

The fourth proportional to 973.05, 1,341.90 and 640.89 is: 883.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.05 : 1,341.90 = 640.89 : x
  2. Step 2: Convert to fraction form
    973.05/1,341.90 = 640.89/x
  3. Step 3: Cross multiply
    973.05x = 1,341.90 × 640.89
  4. Step 4: Simplify right side
    973.05x = 860,012.12
  5. Step 5: Solve for x
    x = 860,012.12/973.05
  6. Step 6: Final answer
    x = 883.84

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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.