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Finding the Fourth Proportional to 841.39, 1,261.51 and 402.40

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Solution

The fourth proportional to 841.39, 1,261.51 and 402.40 is: 603.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.39 : 1,261.51 = 402.40 : x
  2. Step 2: Convert to fraction form
    841.39/1,261.51 = 402.40/x
  3. Step 3: Cross multiply
    841.39x = 1,261.51 × 402.40
  4. Step 4: Simplify right side
    841.39x = 507,632.19
  5. Step 5: Solve for x
    x = 507,632.19/841.39
  6. Step 6: Final answer
    x = 603.33

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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.