Home / 2,688.15-4,031.01-1,390.53

Finding the Fourth Proportional to 2,688.15, 4,031.01 and 1,390.53

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Solution

The fourth proportional to 2,688.15, 4,031.01 and 1,390.53 is: 2,085.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,688.15 : 4,031.01 = 1,390.53 : x
  2. Step 2: Convert to fraction form
    2,688.15/4,031.01 = 1,390.53/x
  3. Step 3: Cross multiply
    2,688.15x = 4,031.01 × 1,390.53
  4. Step 4: Simplify right side
    2,688.15x = 5,605,233.38
  5. Step 5: Solve for x
    x = 5,605,233.38/2,688.15
  6. Step 6: Final answer
    x = 2,085.16

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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.