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Finding the Fourth Proportional to 491.40, 734.40 and 442.80

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Solution

The fourth proportional to 491.40, 734.40 and 442.80 is: 661.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.40 : 734.40 = 442.80 : x
  2. Step 2: Convert to fraction form
    491.40/734.40 = 442.80/x
  3. Step 3: Cross multiply
    491.40x = 734.40 × 442.80
  4. Step 4: Simplify right side
    491.40x = 325,192.32
  5. Step 5: Solve for x
    x = 325,192.32/491.40
  6. Step 6: Final answer
    x = 661.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.