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Finding the Fourth Proportional to 15,159.34, 20,916.39 and 8,870.50

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Solution

The fourth proportional to 15,159.34, 20,916.39 and 8,870.50 is: 12,239.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,159.34 : 20,916.39 = 8,870.50 : x
  2. Step 2: Convert to fraction form
    15,159.34/20,916.39 = 8,870.50/x
  3. Step 3: Cross multiply
    15,159.34x = 20,916.39 × 8,870.50
  4. Step 4: Simplify right side
    15,159.34x = 185,538,837.50
  5. Step 5: Solve for x
    x = 185,538,837.50/15,159.34
  6. Step 6: Final answer
    x = 12,239.24

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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.