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Finding the Fourth Proportional to 28,646.65, 42,959.68 and 9,921.64

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Solution

The fourth proportional to 28,646.65, 42,959.68 and 9,921.64 is: 14,878.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,646.65 : 42,959.68 = 9,921.64 : x
  2. Step 2: Convert to fraction form
    28,646.65/42,959.68 = 9,921.64/x
  3. Step 3: Cross multiply
    28,646.65x = 42,959.68 × 9,921.64
  4. Step 4: Simplify right side
    28,646.65x = 426,230,479.48
  5. Step 5: Solve for x
    x = 426,230,479.48/28,646.65
  6. Step 6: Final answer
    x = 14,878.89

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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.