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Finding the Fourth Proportional to 28,506, 39,339.12 and 15,930.78

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Solution

The fourth proportional to 28,506, 39,339.12 and 15,930.78 is: 21,984.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,506 : 39,339.12 = 15,930.78 : x
  2. Step 2: Convert to fraction form
    28,506/39,339.12 = 15,930.78/x
  3. Step 3: Cross multiply
    28,506x = 39,339.12 × 15,930.78
  4. Step 4: Simplify right side
    28,506x = 626,702,866.11
  5. Step 5: Solve for x
    x = 626,702,866.11/28,506
  6. Step 6: Final answer
    x = 21,984.95

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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.