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Finding the Fourth Proportional to 15,870.52, 21,900.99 and 9,155.67

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Solution

The fourth proportional to 15,870.52, 21,900.99 and 9,155.67 is: 12,634.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,870.52 : 21,900.99 = 9,155.67 : x
  2. Step 2: Convert to fraction form
    15,870.52/21,900.99 = 9,155.67/x
  3. Step 3: Cross multiply
    15,870.52x = 21,900.99 × 9,155.67
  4. Step 4: Simplify right side
    15,870.52x = 200,518,237.11
  5. Step 5: Solve for x
    x = 200,518,237.11/15,870.52
  6. Step 6: Final answer
    x = 12,634.64

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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.