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Finding the Fourth Proportional to 28,159.79, 38,860.02 and 15,412.68

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Solution

The fourth proportional to 28,159.79, 38,860.02 and 15,412.68 is: 21,269.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,159.79 : 38,860.02 = 15,412.68 : x
  2. Step 2: Convert to fraction form
    28,159.79/38,860.02 = 15,412.68/x
  3. Step 3: Cross multiply
    28,159.79x = 38,860.02 × 15,412.68
  4. Step 4: Simplify right side
    28,159.79x = 598,937,053.05
  5. Step 5: Solve for x
    x = 598,937,053.05/28,159.79
  6. Step 6: Final answer
    x = 21,269.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.