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Finding the Fourth Proportional to 15,087.30, 20,821.02 and 9,117.82

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Solution

The fourth proportional to 15,087.30, 20,821.02 and 9,117.82 is: 12,582.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,087.30 : 20,821.02 = 9,117.82 : x
  2. Step 2: Convert to fraction form
    15,087.30/20,821.02 = 9,117.82/x
  3. Step 3: Cross multiply
    15,087.30x = 20,821.02 × 9,117.82
  4. Step 4: Simplify right side
    15,087.30x = 189,842,312.58
  5. Step 5: Solve for x
    x = 189,842,312.58/15,087.30
  6. Step 6: Final answer
    x = 12,582.92

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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.