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Finding the Fourth Proportional to 973.19, 1,342.32 and 641.28

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Solution

The fourth proportional to 973.19, 1,342.32 and 641.28 is: 884.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.19 : 1,342.32 = 641.28 : x
  2. Step 2: Convert to fraction form
    973.19/1,342.32 = 641.28/x
  3. Step 3: Cross multiply
    973.19x = 1,342.32 × 641.28
  4. Step 4: Simplify right side
    973.19x = 860,802.97
  5. Step 5: Solve for x
    x = 860,802.97/973.19
  6. Step 6: Final answer
    x = 884.52

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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.