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Finding the Fourth Proportional to 973.70, 1,342.98 and 690

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Solution

The fourth proportional to 973.70, 1,342.98 and 690 is: 951.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.70 : 1,342.98 = 690 : x
  2. Step 2: Convert to fraction form
    973.70/1,342.98 = 690/x
  3. Step 3: Cross multiply
    973.70x = 1,342.98 × 690
  4. Step 4: Simplify right side
    973.70x = 926,656.20
  5. Step 5: Solve for x
    x = 926,656.20/973.70
  6. Step 6: Final answer
    x = 951.69

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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.