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Finding the Fourth Proportional to 10,621, 15,931.50 and 4,465

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Solution

The fourth proportional to 10,621, 15,931.50 and 4,465 is: 6,697.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,621 : 15,931.50 = 4,465 : x
  2. Step 2: Convert to fraction form
    10,621/15,931.50 = 4,465/x
  3. Step 3: Cross multiply
    10,621x = 15,931.50 × 4,465
  4. Step 4: Simplify right side
    10,621x = 71,134,147.50
  5. Step 5: Solve for x
    x = 71,134,147.50/10,621
  6. Step 6: Final answer
    x = 6,697.50

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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.