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Finding the Fourth Proportional to 840.84, 1,259.42 and 429.26

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Solution

The fourth proportional to 840.84, 1,259.42 and 429.26 is: 642.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.84 : 1,259.42 = 429.26 : x
  2. Step 2: Convert to fraction form
    840.84/1,259.42 = 429.26/x
  3. Step 3: Cross multiply
    840.84x = 1,259.42 × 429.26
  4. Step 4: Simplify right side
    840.84x = 540,618.63
  5. Step 5: Solve for x
    x = 540,618.63/840.84
  6. Step 6: Final answer
    x = 642.95

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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.