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Finding the Fourth Proportional to 21,043.68, 31,569.12 and 9,955.68

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Solution

The fourth proportional to 21,043.68, 31,569.12 and 9,955.68 is: 14,935.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,043.68 : 31,569.12 = 9,955.68 : x
  2. Step 2: Convert to fraction form
    21,043.68/31,569.12 = 9,955.68/x
  3. Step 3: Cross multiply
    21,043.68x = 31,569.12 × 9,955.68
  4. Step 4: Simplify right side
    21,043.68x = 314,292,056.60
  5. Step 5: Solve for x
    x = 314,292,056.60/21,043.68
  6. Step 6: Final answer
    x = 14,935.22

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1.5x scale

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.