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Finding the Fourth Proportional to 1,293.40, 1,938.48 and 643.96

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Solution

The fourth proportional to 1,293.40, 1,938.48 and 643.96 is: 965.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.40 : 1,938.48 = 643.96 : x
  2. Step 2: Convert to fraction form
    1,293.40/1,938.48 = 643.96/x
  3. Step 3: Cross multiply
    1,293.40x = 1,938.48 × 643.96
  4. Step 4: Simplify right side
    1,293.40x = 1,248,303.58
  5. Step 5: Solve for x
    x = 1,248,303.58/1,293.40
  6. Step 6: Final answer
    x = 965.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.