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Finding the Fourth Proportional to 2,646.93, 3,970.48 and 981.47

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Solution

The fourth proportional to 2,646.93, 3,970.48 and 981.47 is: 1,472.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,646.93 : 3,970.48 = 981.47 : x
  2. Step 2: Convert to fraction form
    2,646.93/3,970.48 = 981.47/x
  3. Step 3: Cross multiply
    2,646.93x = 3,970.48 × 981.47
  4. Step 4: Simplify right side
    2,646.93x = 3,896,897.73
  5. Step 5: Solve for x
    x = 3,896,897.73/2,646.93
  6. Step 6: Final answer
    x = 1,472.23

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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.