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Finding the Fourth Proportional to 973.50, 1,344.51 and 643.38

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Solution

The fourth proportional to 973.50, 1,344.51 and 643.38 is: 888.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.50 : 1,344.51 = 643.38 : x
  2. Step 2: Convert to fraction form
    973.50/1,344.51 = 643.38/x
  3. Step 3: Cross multiply
    973.50x = 1,344.51 × 643.38
  4. Step 4: Simplify right side
    973.50x = 865,030.84
  5. Step 5: Solve for x
    x = 865,030.84/973.50
  6. Step 6: Final answer
    x = 888.58

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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.