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Finding the Fourth Proportional to 841.51, 1,161.30 and 492.40

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Solution

The fourth proportional to 841.51, 1,161.30 and 492.40 is: 679.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.51 : 1,161.30 = 492.40 : x
  2. Step 2: Convert to fraction form
    841.51/1,161.30 = 492.40/x
  3. Step 3: Cross multiply
    841.51x = 1,161.30 × 492.40
  4. Step 4: Simplify right side
    841.51x = 571,824.12
  5. Step 5: Solve for x
    x = 571,824.12/841.51
  6. Step 6: Final answer
    x = 679.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.