Home / 28,115.17-42,172.08-9,139.78

Finding the Fourth Proportional to 28,115.17, 42,172.08 and 9,139.78

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Solution

The fourth proportional to 28,115.17, 42,172.08 and 9,139.78 is: 13,709.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,115.17 : 42,172.08 = 9,139.78 : x
  2. Step 2: Convert to fraction form
    28,115.17/42,172.08 = 9,139.78/x
  3. Step 3: Cross multiply
    28,115.17x = 42,172.08 × 9,139.78
  4. Step 4: Simplify right side
    28,115.17x = 385,443,533.34
  5. Step 5: Solve for x
    x = 385,443,533.34/28,115.17
  6. Step 6: Final answer
    x = 13,709.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.