Home / 5,125.90-7,688.99-1,428.40

Finding the Fourth Proportional to 5,125.90, 7,688.99 and 1,428.40

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Solution

The fourth proportional to 5,125.90, 7,688.99 and 1,428.40 is: 2,142.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,125.90 : 7,688.99 = 1,428.40 : x
  2. Step 2: Convert to fraction form
    5,125.90/7,688.99 = 1,428.40/x
  3. Step 3: Cross multiply
    5,125.90x = 7,688.99 × 1,428.40
  4. Step 4: Simplify right side
    5,125.90x = 10,982,953.32
  5. Step 5: Solve for x
    x = 10,982,953.32/5,125.90
  6. Step 6: Final answer
    x = 2,142.64

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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.