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Finding the Fourth Proportional to 28,642.70, 42,955.79 and 9,921.98

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Solution

The fourth proportional to 28,642.70, 42,955.79 and 9,921.98 is: 14,880.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,642.70 : 42,955.79 = 9,921.98 : x
  2. Step 2: Convert to fraction form
    28,642.70/42,955.79 = 9,921.98/x
  3. Step 3: Cross multiply
    28,642.70x = 42,955.79 × 9,921.98
  4. Step 4: Simplify right side
    28,642.70x = 426,206,547.04
  5. Step 5: Solve for x
    x = 426,206,547.04/28,642.70
  6. Step 6: Final answer
    x = 14,880.11

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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.