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Finding the Fourth Proportional to 1,240.03, 1,858.56 and 508.78

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Solution

The fourth proportional to 1,240.03, 1,858.56 and 508.78 is: 762.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.03 : 1,858.56 = 508.78 : x
  2. Step 2: Convert to fraction form
    1,240.03/1,858.56 = 508.78/x
  3. Step 3: Cross multiply
    1,240.03x = 1,858.56 × 508.78
  4. Step 4: Simplify right side
    1,240.03x = 945,598.16
  5. Step 5: Solve for x
    x = 945,598.16/1,240.03
  6. Step 6: Final answer
    x = 762.56

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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.