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Finding the Fourth Proportional to 840.40, 1,260.52 and 292.58

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Solution

The fourth proportional to 840.40, 1,260.52 and 292.58 is: 438.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.40 : 1,260.52 = 292.58 : x
  2. Step 2: Convert to fraction form
    840.40/1,260.52 = 292.58/x
  3. Step 3: Cross multiply
    840.40x = 1,260.52 × 292.58
  4. Step 4: Simplify right side
    840.40x = 368,802.94
  5. Step 5: Solve for x
    x = 368,802.94/840.40
  6. Step 6: Final answer
    x = 438.84

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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.