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Finding the Fourth Proportional to 973.71, 1,343.38 and 678.87

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Solution

The fourth proportional to 973.71, 1,343.38 and 678.87 is: 936.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.71 : 1,343.38 = 678.87 : x
  2. Step 2: Convert to fraction form
    973.71/1,343.38 = 678.87/x
  3. Step 3: Cross multiply
    973.71x = 1,343.38 × 678.87
  4. Step 4: Simplify right side
    973.71x = 911,980.38
  5. Step 5: Solve for x
    x = 911,980.38/973.71
  6. Step 6: Final answer
    x = 936.60

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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.