Home / 1,240.10-1,860.18-509.18

Finding the Fourth Proportional to 1,240.10, 1,860.18 and 509.18

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Solution

The fourth proportional to 1,240.10, 1,860.18 and 509.18 is: 763.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.10 : 1,860.18 = 509.18 : x
  2. Step 2: Convert to fraction form
    1,240.10/1,860.18 = 509.18/x
  3. Step 3: Cross multiply
    1,240.10x = 1,860.18 × 509.18
  4. Step 4: Simplify right side
    1,240.10x = 947,166.45
  5. Step 5: Solve for x
    x = 947,166.45/1,240.10
  6. Step 6: Final answer
    x = 763.78

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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.