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Finding the Fourth Proportional to 28,015.65, 38,661.02 and 15,440.40

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Solution

The fourth proportional to 28,015.65, 38,661.02 and 15,440.40 is: 21,307.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,015.65 : 38,661.02 = 15,440.40 : x
  2. Step 2: Convert to fraction form
    28,015.65/38,661.02 = 15,440.40/x
  3. Step 3: Cross multiply
    28,015.65x = 38,661.02 × 15,440.40
  4. Step 4: Simplify right side
    28,015.65x = 596,941,613.21
  5. Step 5: Solve for x
    x = 596,941,613.21/28,015.65
  6. Step 6: Final answer
    x = 21,307.43

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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.