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Finding the Fourth Proportional to 973.01, 1,343.20 and 623.90

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Solution

The fourth proportional to 973.01, 1,343.20 and 623.90 is: 861.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.01 : 1,343.20 = 623.90 : x
  2. Step 2: Convert to fraction form
    973.01/1,343.20 = 623.90/x
  3. Step 3: Cross multiply
    973.01x = 1,343.20 × 623.90
  4. Step 4: Simplify right side
    973.01x = 838,022.48
  5. Step 5: Solve for x
    x = 838,022.48/973.01
  6. Step 6: Final answer
    x = 861.27

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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.