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Finding the Fourth Proportional to 1,240.21, 1,860.32 and 510.40

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Solution

The fourth proportional to 1,240.21, 1,860.32 and 510.40 is: 765.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.21 : 1,860.32 = 510.40 : x
  2. Step 2: Convert to fraction form
    1,240.21/1,860.32 = 510.40/x
  3. Step 3: Cross multiply
    1,240.21x = 1,860.32 × 510.40
  4. Step 4: Simplify right side
    1,240.21x = 949,507.33
  5. Step 5: Solve for x
    x = 949,507.33/1,240.21
  6. Step 6: Final answer
    x = 765.60

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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.