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Finding the Fourth Proportional to 840.03, 1,260.55 and 531.45

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Solution

The fourth proportional to 840.03, 1,260.55 and 531.45 is: 797.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.03 : 1,260.55 = 531.45 : x
  2. Step 2: Convert to fraction form
    840.03/1,260.55 = 531.45/x
  3. Step 3: Cross multiply
    840.03x = 1,260.55 × 531.45
  4. Step 4: Simplify right side
    840.03x = 669,919.30
  5. Step 5: Solve for x
    x = 669,919.30/840.03
  6. Step 6: Final answer
    x = 797.49

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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.