Home / 5,125.69-7,688.58-1,428.20

Finding the Fourth Proportional to 5,125.69, 7,688.58 and 1,428.20

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Solution

The fourth proportional to 5,125.69, 7,688.58 and 1,428.20 is: 2,142.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,125.69 : 7,688.58 = 1,428.20 : x
  2. Step 2: Convert to fraction form
    5,125.69/7,688.58 = 1,428.20/x
  3. Step 3: Cross multiply
    5,125.69x = 7,688.58 × 1,428.20
  4. Step 4: Simplify right side
    5,125.69x = 10,980,829.96
  5. Step 5: Solve for x
    x = 10,980,829.96/5,125.69
  6. Step 6: Final answer
    x = 2,142.31

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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.